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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en"><italic>Lactobacillus reuteri</italic> DSM 17938 for managing infant colic: protocol for an individual participant data meta-analysis</title><author><name sortKey="Sung, Valerie" sort="Sung, Valerie" uniqKey="Sung V" first="Valerie" last="Sung">Valerie Sung</name><affiliation><nlm:aff id="af1"><institution>Murdoch Childrens Research Institute, Royal Children's Hospital, The University of Melbourne</institution>,<addr-line>Melbourne, Victoria</addr-line>,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Cabana, Michael D" sort="Cabana, Michael D" uniqKey="Cabana M" first="Michael D" last="Cabana">Michael D. Cabana</name><affiliation><nlm:aff id="af2"><addr-line>Department of Pediatrics, Epidemiology and Biostatistics</addr-line>,<institution>University of California, San Francisco (UCSF) School of Medicine</institution>,<addr-line>San Francisco, California</addr-line>,<country>USA</country></nlm:aff></affiliation></author><author><name sortKey="D Amico, Frank" sort="D Amico, Frank" uniqKey="D Amico F" first="Frank" last="D'Amico">Frank D'Amico</name><affiliation><nlm:aff id="af3"><institution>Duquesne University/UPMC St. Margaret Hospital</institution>,<addr-line>Pittsburgh, Pennsylvania</addr-line>,<country>USA</country></nlm:aff></affiliation></author><author><name sortKey="Deshpande, Girish" sort="Deshpande, Girish" uniqKey="Deshpande G" first="Girish" last="Deshpande">Girish Deshpande</name><affiliation><nlm:aff id="af4"><addr-line>Department of Children's health division and NICU</addr-line>,<institution>Nepean Hospital Sydney</institution>,<addr-line>Sydney, New South Wales</addr-line>,<country>Australia</country></nlm:aff></affiliation><affiliation><nlm:aff id="af5"><institution>Sydney Medical School Nepean, University of Sydney</institution>,<addr-line>Sydney, New South Wales</addr-line>,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Dupont, Christophe" sort="Dupont, Christophe" uniqKey="Dupont C" first="Christophe" last="Dupont">Christophe Dupont</name><affiliation><nlm:aff id="af6"><addr-line>Department of Pediatric Gastroenterology</addr-line>,<institution>Paris Descartes University, Necker Hospital</institution>,<addr-line>Paris</addr-line>,<country>France</country></nlm:aff></affiliation></author><author><name sortKey="Indrio, Flavia" sort="Indrio, Flavia" uniqKey="Indrio F" first="Flavia" last="Indrio">Flavia Indrio</name><affiliation><nlm:aff id="af7"><addr-line>Department of Pediatrics</addr-line>,<institution>University of Bari</institution>,<addr-line>Bari</addr-line>,<country>Italy</country></nlm:aff></affiliation></author><author><name sortKey="Mentula, Silja" sort="Mentula, Silja" uniqKey="Mentula S" first="Silja" last="Mentula">Silja Mentula</name><affiliation><nlm:aff id="af8"><addr-line>Bacteriology Unit</addr-line>,<institution>National Institute for Health and Welfare</institution>,<addr-line>Helsinki</addr-line>,<country>Finland</country></nlm:aff></affiliation></author><author><name sortKey="Partty, Anna" sort="Partty, Anna" uniqKey="Partty A" first="Anna" last="Partty">Anna Partty</name><affiliation><nlm:aff id="af9"><addr-line>Department of Pediatrics and Adolescent Medicine</addr-line>,<institution>Turku University Hospital</institution>,<addr-line>Turku</addr-line>,<country>Finland</country></nlm:aff></affiliation></author><author><name sortKey="Savino, Francesco" sort="Savino, Francesco" uniqKey="Savino F" first="Francesco" last="Savino">Francesco Savino</name><affiliation><nlm:aff id="af10"><institution>Ospedale Infantile Regina Margherita, Città della Salute e della Scienza di Torino</institution>,<addr-line>Torino</addr-line>,<country>Italy</country></nlm:aff></affiliation></author><author><name sortKey="Szajewska, Hania" sort="Szajewska, Hania" uniqKey="Szajewska H" first="Hania" last="Szajewska">Hania Szajewska</name><affiliation><nlm:aff id="af11"><addr-line>Department of Paediatrics</addr-line>,<institution>The Medical University of Warsaw</institution>,<addr-line>Warsaw</addr-line>,<country>Poland</country></nlm:aff></affiliation></author><author><name sortKey="Tancredi, Daniel" sort="Tancredi, Daniel" uniqKey="Tancredi D" first="Daniel" last="Tancredi">Daniel Tancredi</name><affiliation><nlm:aff id="af12"><addr-line>Department of Pediatrics</addr-line>,<institution>UC Davis Health System</institution>,<addr-line>Sacramento, California</addr-line>,<country>USA</country></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25475244</idno><idno type="pmc">4256605</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4256605</idno><idno type="RBID">PMC:4256605</idno><idno type="doi">10.1136/bmjopen-2014-006475</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">001355</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001355</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main"><italic>Lactobacillus reuteri</italic> DSM 17938 for managing infant colic: protocol for an individual participant data meta-analysis</title><author><name sortKey="Sung, Valerie" sort="Sung, Valerie" uniqKey="Sung V" first="Valerie" last="Sung">Valerie Sung</name><affiliation><nlm:aff id="af1"><institution>Murdoch Childrens Research Institute, Royal Children's Hospital, The University of Melbourne</institution>,<addr-line>Melbourne, Victoria</addr-line>,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Cabana, Michael D" sort="Cabana, Michael D" uniqKey="Cabana M" first="Michael D" last="Cabana">Michael D. Cabana</name><affiliation><nlm:aff id="af2"><addr-line>Department of Pediatrics, Epidemiology and Biostatistics</addr-line>,<institution>University of California, San Francisco (UCSF) School of Medicine</institution>,<addr-line>San Francisco, California</addr-line>,<country>USA</country></nlm:aff></affiliation></author><author><name sortKey="D Amico, Frank" sort="D Amico, Frank" uniqKey="D Amico F" first="Frank" last="D'Amico">Frank D'Amico</name><affiliation><nlm:aff id="af3"><institution>Duquesne University/UPMC St. Margaret Hospital</institution>,<addr-line>Pittsburgh, Pennsylvania</addr-line>,<country>USA</country></nlm:aff></affiliation></author><author><name sortKey="Deshpande, Girish" sort="Deshpande, Girish" uniqKey="Deshpande G" first="Girish" last="Deshpande">Girish Deshpande</name><affiliation><nlm:aff id="af4"><addr-line>Department of Children's health division and NICU</addr-line>,<institution>Nepean Hospital Sydney</institution>,<addr-line>Sydney, New South Wales</addr-line>,<country>Australia</country></nlm:aff></affiliation><affiliation><nlm:aff id="af5"><institution>Sydney Medical School Nepean, University of Sydney</institution>,<addr-line>Sydney, New South Wales</addr-line>,<country>Australia</country></nlm:aff></affiliation></author><author><name sortKey="Dupont, Christophe" sort="Dupont, Christophe" uniqKey="Dupont C" first="Christophe" last="Dupont">Christophe Dupont</name><affiliation><nlm:aff id="af6"><addr-line>Department of Pediatric Gastroenterology</addr-line>,<institution>Paris Descartes University, Necker Hospital</institution>,<addr-line>Paris</addr-line>,<country>France</country></nlm:aff></affiliation></author><author><name sortKey="Indrio, Flavia" sort="Indrio, Flavia" uniqKey="Indrio F" first="Flavia" last="Indrio">Flavia Indrio</name><affiliation><nlm:aff id="af7"><addr-line>Department of Pediatrics</addr-line>,<institution>University of Bari</institution>,<addr-line>Bari</addr-line>,<country>Italy</country></nlm:aff></affiliation></author><author><name sortKey="Mentula, Silja" sort="Mentula, Silja" uniqKey="Mentula S" first="Silja" last="Mentula">Silja Mentula</name><affiliation><nlm:aff id="af8"><addr-line>Bacteriology Unit</addr-line>,<institution>National Institute for Health and Welfare</institution>,<addr-line>Helsinki</addr-line>,<country>Finland</country></nlm:aff></affiliation></author><author><name sortKey="Partty, Anna" sort="Partty, Anna" uniqKey="Partty A" first="Anna" last="Partty">Anna Partty</name><affiliation><nlm:aff id="af9"><addr-line>Department of Pediatrics and Adolescent Medicine</addr-line>,<institution>Turku University Hospital</institution>,<addr-line>Turku</addr-line>,<country>Finland</country></nlm:aff></affiliation></author><author><name sortKey="Savino, Francesco" sort="Savino, Francesco" uniqKey="Savino F" first="Francesco" last="Savino">Francesco Savino</name><affiliation><nlm:aff id="af10"><institution>Ospedale Infantile Regina Margherita, Città della Salute e della Scienza di Torino</institution>,<addr-line>Torino</addr-line>,<country>Italy</country></nlm:aff></affiliation></author><author><name sortKey="Szajewska, Hania" sort="Szajewska, Hania" uniqKey="Szajewska H" first="Hania" last="Szajewska">Hania Szajewska</name><affiliation><nlm:aff id="af11"><addr-line>Department of Paediatrics</addr-line>,<institution>The Medical University of Warsaw</institution>,<addr-line>Warsaw</addr-line>,<country>Poland</country></nlm:aff></affiliation></author><author><name sortKey="Tancredi, Daniel" sort="Tancredi, Daniel" uniqKey="Tancredi D" first="Daniel" last="Tancredi">Daniel Tancredi</name><affiliation><nlm:aff id="af12"><addr-line>Department of Pediatrics</addr-line>,<institution>UC Davis Health System</institution>,<addr-line>Sacramento, California</addr-line>,<country>USA</country></nlm:aff></affiliation></author></analytic><series><title level="j">BMJ Open</title><idno type="eISSN">2044-6055</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Introduction</title><p>Infant colic, or excessive crying of unknown cause in infants less than 3 months old, is common and burdensome. Its aetiology is undetermined, and consensus on its management is still lacking. Recent studies suggest a possible link between infant colic and gut microbiota, indicating probiotics to be a promising treatment. However, only a few strains have been tested, and results from randomised controlled trials are conflicting. It is important to clarify whether probiotics are effective for treating infant colic in general, and to identify whether certain subgroups of infants with colic would benefit from particular strains of probiotics.</p></sec><sec><title>Methods and analysis</title><p>Through an individual participant data meta-analysis (IPDMA), we aim to identify whether the probiotic <italic>Lactobacillus reuteri</italic> DSM 17938 is effective in the management of infant colic, and to clarify whether its effects differ according to feeding method (breast vs formula vs combined), proton pump inhibitor exposure, and antibiotic exposure. The primary outcomes are infant crying duration and treatment success (at least 50% reduction in crying time from baseline) at 21 days postintervention. Individual participant data from all studies will be modelled simultaneously in multilevel generalised linear mixed-effects regression models to account for the nesting of participants within studies. Subgroup analyses of participant-level and intervention-level characteristics will be undertaken on the primary outcomes to assess if the intervention effect differs between certain groups of infants.</p></sec><sec><title>Ethics and dissemination</title><p>Approved by the Royal Children's Hospital Human Research Ethics Committee (HREC 34081). Results will be reported in a peer-reviewed journal in 2015.</p></sec><sec><title>Trial registration number</title><p>PROSPERO CRD42014013210.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Lucassen, Pl" uniqKey="Lucassen P">PL Lucassen</name></author><author><name sortKey="Assendelft, Wj" uniqKey="Assendelft W">WJ Assendelft</name></author><author><name sortKey="Van Eijk, Jt" uniqKey="Van Eijk J">JT van Eijk</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Mcmahon, C" uniqKey="Mcmahon C">C McMahon</name></author><author><name sortKey="Barnett, B" uniqKey="Barnett B">B Barnett</name></author><author><name sortKey="Kowalenko, N" uniqKey="Kowalenko N">N Kowalenko</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Smart, J" uniqKey="Smart J">J Smart</name></author><author><name sortKey="Hiscock, H" uniqKey="Hiscock H">H 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<front><journal-meta><journal-id journal-id-type="nlm-ta">BMJ Open</journal-id><journal-id journal-id-type="iso-abbrev">BMJ Open</journal-id><journal-id journal-id-type="hwp">bmjopen</journal-id><journal-id journal-id-type="publisher-id">bmjopen</journal-id><journal-title-group><journal-title>BMJ Open</journal-title></journal-title-group><issn pub-type="epub">2044-6055</issn><publisher><publisher-name>BMJ Publishing Group</publisher-name><publisher-loc>BMA House, Tavistock Square, London, WC1H 9JR</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25475244</article-id><article-id pub-id-type="pmc">4256605</article-id><article-id pub-id-type="publisher-id">bmjopen-2014-006475</article-id><article-id pub-id-type="doi">10.1136/bmjopen-2014-006475</article-id><article-categories><subj-group subj-group-type="heading"><subject>Paediatrics</subject><subj-group><subject>Protocol</subject></subj-group></subj-group><subj-group subj-group-type="hwp-journal-coll"><subject>1506</subject><subject>1719</subject><subject>1724</subject></subj-group></article-categories><title-group><article-title><italic>Lactobacillus reuteri</italic> DSM 17938 for managing infant colic: protocol for an individual participant data meta-analysis</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Sung</surname><given-names>Valerie</given-names></name><xref ref-type="aff" rid="af1">1</xref></contrib><contrib contrib-type="author"><name><surname>Cabana</surname><given-names>Michael D</given-names></name><xref ref-type="aff" rid="af2">2</xref></contrib><contrib contrib-type="author"><name><surname>D'Amico</surname><given-names>Frank</given-names></name><xref ref-type="aff" rid="af3">3</xref></contrib><contrib contrib-type="author"><name><surname>Deshpande</surname><given-names>Girish</given-names></name><xref ref-type="aff" rid="af4">4</xref><xref ref-type="aff" rid="af5">5</xref></contrib><contrib contrib-type="author"><name><surname>Dupont</surname><given-names>Christophe</given-names></name><xref ref-type="aff" rid="af6">6</xref></contrib><contrib contrib-type="author"><name><surname>Indrio</surname><given-names>Flavia</given-names></name><xref ref-type="aff" rid="af7">7</xref></contrib><contrib contrib-type="author"><name><surname>Mentula</surname><given-names>Silja</given-names></name><xref ref-type="aff" rid="af8">8</xref></contrib><contrib contrib-type="author"><name><surname>Partty</surname><given-names>Anna</given-names></name><xref ref-type="aff" rid="af9">9</xref></contrib><contrib contrib-type="author"><name><surname>Savino</surname><given-names>Francesco</given-names></name><xref ref-type="aff" rid="af10">10</xref></contrib><contrib contrib-type="author"><name><surname>Szajewska</surname><given-names>Hania</given-names></name><xref ref-type="aff" rid="af11">11</xref></contrib><contrib contrib-type="author"><name><surname>Tancredi</surname><given-names>Daniel</given-names></name><xref ref-type="aff" rid="af12">12</xref></contrib></contrib-group><aff id="af1"><label>1</label><institution>Murdoch Childrens Research Institute, Royal Children's Hospital, The University of Melbourne</institution>,<addr-line>Melbourne, Victoria</addr-line>,<country>Australia</country></aff><aff id="af2"><label>2</label><addr-line>Department of Pediatrics, Epidemiology and Biostatistics</addr-line>,<institution>University of California, San Francisco (UCSF) School of Medicine</institution>,<addr-line>San Francisco, California</addr-line>,<country>USA</country></aff><aff id="af3"><label>3</label><institution>Duquesne University/UPMC St. Margaret Hospital</institution>,<addr-line>Pittsburgh, Pennsylvania</addr-line>,<country>USA</country></aff><aff id="af4"><label>4</label><addr-line>Department of Children's health division and NICU</addr-line>,<institution>Nepean Hospital Sydney</institution>,<addr-line>Sydney, New South Wales</addr-line>,<country>Australia</country></aff><aff id="af5"><label>5</label><institution>Sydney Medical School Nepean, University of Sydney</institution>,<addr-line>Sydney, New South Wales</addr-line>,<country>Australia</country></aff><aff id="af6"><label>6</label><addr-line>Department of Pediatric Gastroenterology</addr-line>,<institution>Paris Descartes University, Necker Hospital</institution>,<addr-line>Paris</addr-line>,<country>France</country></aff><aff id="af7"><label>7</label><addr-line>Department of Pediatrics</addr-line>,<institution>University of Bari</institution>,<addr-line>Bari</addr-line>,<country>Italy</country></aff><aff id="af8"><label>8</label><addr-line>Bacteriology Unit</addr-line>,<institution>National Institute for Health and Welfare</institution>,<addr-line>Helsinki</addr-line>,<country>Finland</country></aff><aff id="af9"><label>9</label><addr-line>Department of Pediatrics and Adolescent Medicine</addr-line>,<institution>Turku University Hospital</institution>,<addr-line>Turku</addr-line>,<country>Finland</country></aff><aff id="af10"><label>10</label><institution>Ospedale Infantile Regina Margherita, Città della Salute e della Scienza di Torino</institution>,<addr-line>Torino</addr-line>,<country>Italy</country></aff><aff id="af11"><label>11</label><addr-line>Department of Paediatrics</addr-line>,<institution>The Medical University of Warsaw</institution>,<addr-line>Warsaw</addr-line>,<country>Poland</country></aff><aff id="af12"><label>12</label><addr-line>Department of Pediatrics</addr-line>,<institution>UC Davis Health System</institution>,<addr-line>Sacramento, California</addr-line>,<country>USA</country></aff><author-notes><corresp><label>Correspondence to</label> Dr Valerie Sung; <email>valerie.sung@rch.org.au</email></corresp></author-notes><pub-date pub-type="collection"><year>2014</year></pub-date><pub-date pub-type="epub"><day>4</day><month>12</month><year>2014</year></pub-date><volume>4</volume><issue>12</issue><elocation-id>e006475</elocation-id><history><date date-type="received"><day>27</day><month>8</month><year>2014</year></date><date date-type="accepted"><day>18</day><month>11</month><year>2014</year></date></history><permissions><copyright-statement>Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions</copyright-statement><copyright-year>2014</copyright-year><license license-type="open-access"><license-p>This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc/4.0/">http://creativecommons.org/licenses/by-nc/4.0/</ext-link></license-p></license></permissions><self-uri xlink:title="pdf" xlink:href="bmjopen-2014-006475.pdf"></self-uri><self-uri content-type="draft-revisions-pdf" xlink:href="bmjopen-2014-006475.draft_revisions.pdf"></self-uri><self-uri content-type="reviewers-comments-pdf" xlink:href="bmjopen-2014-006475.reviewer_comments.pdf"></self-uri><abstract><sec><title>Introduction</title><p>Infant colic, or excessive crying of unknown cause in infants less than 3 months old, is common and burdensome. Its aetiology is undetermined, and consensus on its management is still lacking. Recent studies suggest a possible link between infant colic and gut microbiota, indicating probiotics to be a promising treatment. However, only a few strains have been tested, and results from randomised controlled trials are conflicting. It is important to clarify whether probiotics are effective for treating infant colic in general, and to identify whether certain subgroups of infants with colic would benefit from particular strains of probiotics.</p></sec><sec><title>Methods and analysis</title><p>Through an individual participant data meta-analysis (IPDMA), we aim to identify whether the probiotic <italic>Lactobacillus reuteri</italic> DSM 17938 is effective in the management of infant colic, and to clarify whether its effects differ according to feeding method (breast vs formula vs combined), proton pump inhibitor exposure, and antibiotic exposure. The primary outcomes are infant crying duration and treatment success (at least 50% reduction in crying time from baseline) at 21 days postintervention. Individual participant data from all studies will be modelled simultaneously in multilevel generalised linear mixed-effects regression models to account for the nesting of participants within studies. Subgroup analyses of participant-level and intervention-level characteristics will be undertaken on the primary outcomes to assess if the intervention effect differs between certain groups of infants.</p></sec><sec><title>Ethics and dissemination</title><p>Approved by the Royal Children's Hospital Human Research Ethics Committee (HREC 34081). Results will be reported in a peer-reviewed journal in 2015.</p></sec><sec><title>Trial registration number</title><p>PROSPERO CRD42014013210.</p></sec></abstract><kwd-group><kwd>PERINATOLOGY</kwd><kwd>NUTRITION & DIETETICS</kwd><kwd>COMPLEMENTARY MEDICINE</kwd></kwd-group></article-meta></front><body><boxed-text position="float" orientation="portrait"><caption><title>Strengths and limitations of this study</title></caption><list list-type="bullet"><list-item><p>This is the first individual participant data meta-analysis (IPDMA) and the most definitive method to assess the effectiveness of <italic>Lactobacillus reuteri</italic> DSM 17938 in managing infants with colic, and to clarify which subgroups of infants with colic may benefit from probiotics.</p></list-item><list-item><p>While individual trials can provide important data, and meta-analyses of randomised controlled trials can give important conclusions, there can be problems with interpreting such conclusions. Combining raw data from individual trials via an IPDMA can yield more reliable estimates of treatment effects with universal applicability. This is particularly important when there is significant chance that particular strains of probiotics may work for particular subgroups of infants with colic, an effect that cannot be detected by individual studies with limited sample sizes.</p></list-item><list-item><p>The study is limited by the number of participating authors who contribute data to the study, and cannot include data from authors who decline participation. It is also limited by inclusion of studies with potentially different methods of defining infant colic and measuring outcomes.</p></list-item></list></boxed-text><sec sec-type="intro" id="s1"><title>Introduction</title><p>Infant colic, or excessive crying of unknown cause, is a common, burdensome condition affecting up to 20% of infants less than 3 months old.<xref rid="R1" ref-type="bibr">1</xref> Although colic self-resolves beyond the first 3 months of life, it is associated with potentially significant adverse effects, such as maternal depression,<xref rid="R2" ref-type="bibr">2</xref><xref rid="R3" ref-type="bibr">3</xref> child abuse,<xref rid="R4" ref-type="bibr">4</xref><xref rid="R5" ref-type="bibr">5</xref> and early cessation of breast feeding.<xref rid="R6" ref-type="bibr">6</xref> There is also some evidence of long-term adverse outcomes, such as behaviour and sleep problems.<xref rid="R7" ref-type="bibr">7</xref><xref rid="R8" ref-type="bibr">8</xref> The aetiology of infant colic remains unresolved, and effective treatment options are limited.<xref rid="R9" ref-type="bibr">9–11</xref></p><p>Recent research has focused on the role of gut microbiota in the pathophysiological pathway to infant colic, with numerous studies revealing differences in gut microbiota between infants with and without colic.<xref rid="R12" ref-type="bibr">12–21</xref> At the same time, a handful of studies have examined the role of probiotics—live microorganisms believed to confer a health benefit—in the management of infant colic. One study of <italic>Lactobacillus reuteri</italic> ATCC 55730<xref rid="R22" ref-type="bibr">22</xref> and two studies of <italic>L. reuteri</italic> DSM 17938<xref rid="R23" ref-type="bibr">23</xref><xref rid="R24" ref-type="bibr">24</xref> in breastfed infants with colic were effective, but a subsequent study of both breastfed and formula-fed infants with colic indicated <italic>L. reuteri</italic> DSM 17938 to be ineffective.<xref rid="R25" ref-type="bibr">25</xref> Two other studies using different mixtures of probiotic strains were also ineffective in <italic>managing</italic> colic.<xref rid="R14" ref-type="bibr">14</xref><xref rid="R26" ref-type="bibr">26</xref> The reasons for such conflicting evidence are unclear, and there is a need to explore the reasons behind such controversial results, particularly with increasing probiotic marketing, variety of strains used, and addition of probiotics to infant formulae.</p><p>Currently, there are some ongoing trials examining the role of probiotics in managing and preventing infant colic, using similar designs, participants, interventions, comparators and outcome measures.<xref rid="R27" ref-type="bibr">27</xref> While individual trials can provide important data, and meta-analyses of randomised controlled trials can give important conclusions, there can be problems with interpreting such conclusions. Ultimately, such meta-analyses often do not overcome limitations and biases of individual trials by generating a single best estimate through pooling of treatment effect estimates.<xref rid="R28" ref-type="bibr">28</xref> In contrast, combining raw data from individual trials via an individual participant data meta-analysis (IPDMA) can yield more reliable estimates of treatment effects with universal applicability.<xref rid="R28" ref-type="bibr">28–32</xref> This is particularly important when there is significant chance that particular strains of probiotics may work for particular subgroups of infants with colic, an effect that cannot be detected by individual studies with limited sample sizes.</p><p>The pooling of data into an IPDMA for analysis will ultimately provide more definitive answers as to whether the probiotic <italic>L. reuteri</italic> DSM 17938 is effective for infant colic, and it will also determine whether certain subgroups of infants would benefit from it. As the effects of probiotics are strain specific,<xref rid="R33" ref-type="bibr">33</xref> this IPDMA will only include the most commonly studied probiotic strain used for the management of infant colic, and will form the protocol basis for further IPDMAs involving other probiotic strains for the management or prevention of infant colic.</p><p>The aims of this IPDMA are:
<list list-type="order"><list-item><p>To determine whether the probiotic <italic>L. reuteri</italic> DSM 17398 is effective in the management of infant colic;</p></list-item><list-item><p>To determine whether the effects of <italic>L. reuteri</italic> DSM 17398 on infants with colic differ according to
<list list-type="alpha-upper"><list-item><p>Type of feeding (exclusively breast fed vs partially breast fed vs exclusively formula fed);</p></list-item><list-item><p>Proton pump inhibitor exposure;</p></list-item><list-item><p>Hypoallergenic formula exposure for formula-fed infants;</p></list-item><list-item><p>Maternal dairy elimination diets for breastfed infants.</p></list-item></list></p></list-item></list></p></sec><sec id="s2"><title>Methods and analysis</title><sec id="s2a"><title>Search methods for identification of studies</title><p>We will search for completed and ongoing randomised controlled trials by identification of published papers and protocols through the online databases MEDLINE, EMBASE, CINAHL, Database of Abstracts of Reviews of Effects (DARE), Cochrane Central Register for Controlled Trials (CENTRAL), and clinical trial registries (eg, metaRegister of Controlled Trials). Reference lists from articles will be explored to identify other potential trials. We will also perform internet searches for non-peer-reviewed articles, media articles and other relevant publications using Google, and approach presenters at relevant conferences and meetings. This IPDMA will be undertaken according to the methods recommended by the Cochrane Collaboration,<xref rid="R34" ref-type="bibr">34</xref> with reporting following the preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines.<xref rid="R35" ref-type="bibr">35</xref></p></sec><sec id="s2b"><title>Eligibility criteria for included RCTs</title><p>The IPDMA will include registered randomised controlled trials of the probiotic <italic>L. reuteri</italic> DSM 17398 versus placebo, delivered orally to infants with modified Wessel's definition of infant colic (crying for more than 3 h of the day, for more than 3 days of the week, for at least 1 week, as recorded by diaries, questionnaires or parental interviews).</p><p>Studies evaluating <italic>L. reuteri</italic> ATCC 55730, the mother strain of <italic>L. reuteri</italic> DSM 17938, will be excluded. <italic>L. reuteri</italic> ATCC 55730 was found to carry potentially transferable resistance traits for tetracycline and lincomycin. Hence, it was replaced by <italic>L. reuteri</italic> DSM 17938, a strain without unwanted plasmid-borne resistance.<xref rid="R36" ref-type="bibr">36</xref> It remains a matter of debate whether or not <italic>L. reuteri</italic> DSM 17938, the strain with antibiotic resistance plasmids removed, and the original <italic>L. reuteri</italic> ATCC 55730 strain can be regarded as equal. Moreover, only <italic>L. reuteri</italic> DSM 17938 is commercially available.</p><p>All authors of eligible trials have been contacted and invited to participate in this IPDMA. As more trials satisfying eligibility criteria get published, the relevant authors will be approached and invited to participate, as long as their trials are published within the time frame of conducting this IPDMA.</p></sec><sec id="s2c"><title>Main outcomes</title><p>The primary outcomes of the IPDMA are:
<list list-type="bullet"><list-item><p>Infant crying duration (minutes per day) at 21 days postintervention;</p></list-item><list-item><p>Treatment success at 21 days postintervention, defined as at least 50% reduction in crying time from baseline.</p></list-item></list></p><p>Secondary outcomes include:
<list list-type="bullet"><list-item><p>Infant crying duration (minutes per day) at days 7, 14 and 28 postintervention;</p></list-item><list-item><p>Treatment success (at least 50% reduction in crying time) at days 7, 14 and 28 postintervention;</p></list-item><list-item><p>Infant sleep duration (minutes per day) per 24 h at 7, 14, 21 and 28 days duration (post-treatment baseline);</p></list-item><list-item><p>Parental report of treatment success, maternal depression, quality of life, and family functioning at the end of the intervention period;</p></list-item><list-item><p>Adverse effects: diarrhoea, constipation, vomiting, apnoea and apparent life-threatening events (ALTE);</p></list-item><list-item><p>Stool colonisation analysis;</p></list-item><list-item><p>Faecal calprotectin levels.</p></list-item></list></p><p>We anticipate that not all included studies will have all secondary outcomes available for analysis, and will analyse only data that are available.</p></sec><sec id="s2d"><title>Sample size and power calculation</title><p>Abstracting data from published randomised trials, estimates of the SDs in crying time (min/day) at baseline and day 21 were collected and pooled to provide an estimated SD of 210 (min/day). From this information, it is estimated that approximately 120 infants per treatment group would be sufficient for detecting a mean difference in treatment groups of 80 min/day (power=0.80, α=0.05, two-tailed). Additionally, approximately 120 per group would also provide 80% power for detecting a difference of 20 percentage points (α=0.05, two-tailed) in the treatment success rates. Treatment success is defined as (yes/no) with ‘yes’ corresponding to at least 50% reduction in crying time from baseline to day 21.</p><p>For subgroup analysis to compare whether treatment effects differed by patient characteristics, hypothesis testing will be based on the comparison of treatment effects between subgroups, with a two-tailed α of 0.10 used to offset the decreased precision available for estimating interaction effects (ie, differences in differences). We specified that it would be clinically significant to detect between-subgroup differences in treatment effects of 150 min/day on the crying time outcome and of 50 percentage points on the treatment success outcome, assuming that one subgroup consists of between 33% and 66% of the full sample and the other subgroup consists of the remainder. For example, if treatment group differences truly are 180 min/day in a prespecified subgroup with one-third of the patients and only 30 min/day for the remaining patients, the difference in treatment effects would correspond to 150 min/day. Again, a sample size of approximately 120 infants provides at least 80% power to detect such clinically important differences.</p><p>At the time of this writing, authors of four trials have agreed to participate. These four trials include three that assessed <italic>L. reuteri</italic> strain DSM 17398, comprising a total of 293 patients with 150 randomised to probiotic and 143 to placebo. Thus, it is projected that this IPDMA will have sufficient power for detecting clinically relevant differences in both the average crying times and success rates of at least 50% reduction from baseline to day 21 between the probiotic and placebo groups.</p></sec><sec id="s2e"><title>Statistical analysis</title><p>The analysis will be conducted with individual participant data from all studies modelled simultaneously in multilevel generalised linear mixed-effects regression models to account for the nesting of participants within studies.<xref rid="R29" ref-type="bibr">29</xref> Models will be specified with fixed-effects terms for the individual participant's binary indicator treatment-assignment (probiotic vs control), a parsimonious set of prespecified participant-level characteristics, and the study identifier. This model specification will be straightforwardly extended to account for when longitudinally assessed outcomes are the units of analysis (one record per time point per participant), by including fixed-effects terms for time (main effects as well as interaction terms with the binary treatment indicator) and random effects for the participant to account for residual within-participant correlation. Standard choices of link and variance functions will be specified, according to type of outcome, with linear-normal models used for suitably (ie, homogeneous) continuous outcomes and logit-binomial and log-Poisson models used for binary and count outcomes, respectively.</p><p>Subgroup analyses of participant-level and intervention-level characteristics will be undertaken on the primary outcomes to assess if the intervention effect differs between certain groups of infants. Heterogeneity of treatment effects will be formally assessed by respecifying regression models with interaction terms for the binary treatment indicator with the candidate-effect modifier and conducting formal hypothesis testing (with a statistical significance threshold reset to 0.10 to help offset the low statistical power associated with testing interaction terms). These characteristics are identified a priori and include: (1) feeding method (exclusively breast fed vs partially breast fed vs exclusively formula fed), (2) proton pump inhibitor exposure, (3) hypoallergenic formula exposure for formula-fed infants and (4) maternal dairy elimination diets for breast-fed infants. Confounders identified a priori will include (1) family history of atopy, (2) delivery type (vaginal vs caesarean), (3) enrolment age and (4) antibiotic use.</p><p>Analysis will be by intention-to-treat; specifically, the binary treatment term will correspond to assigned treatment. Missing data patterns and assumptions will be described, and the potential impact of alternative missing data assumptions on the primary analysis will be explored in sensitivity analyses. The primary analysis will be conducted at the 0.05 level of significance.</p></sec></sec><sec id="s3"><title>Ethics and dissemination</title><sec id="s3a"><title>Ethics committee approval</title><p>The IPDMA has been approved by the Royal Children's Hospital Human Research Ethics Committee (HREC 34081). The IPDMA is registered at PROSPERO, the International Prospective Register of Systematic Reviews, at the University of York (CRD42014013210).</p></sec><sec id="s3b"><title>Project management and data collection</title><p>Membership to the collaboration for this IPDMA will include representatives from each trial contributing data to the project, a project coordination team, and a data management team consisting of two independent statisticians (FDA and DT). The collaboration will collect the minimum de-identified data required to answer the research questions. We will store data in a secure, centralised, customised database, accessible only by a unique passcode known only to the project coordination team, data management team, and managers of each individual study contributing data. The two independent statisticians will inspect the data with respect to range, internal consistency, and missing items by checking them against published reports, trial protocols and, if necessary, data collection sheets. The statisticians will discuss any inconsistencies or missing data with individual trial managers, and any problems will be resolved by consensus using original raw data.</p></sec><sec id="s3c"><title>Data ownership and confidentiality</title><p>All included trials must have been given ethical approval by their respective HREC. Participants in individual trials must have consented to their participation in their respective trial. Each study manager remains the custodian of their own data and retains the right to withdraw their data from the analysis at any time. Data must be de-identified before being shared for this IPDMA. The pooled data can be accessed by the project coordination team, data management team, and managers of each individual study contributing data. The project intellectual property (IP) will be owned by the parties as tenants in common in proportion to their respective contributions to that project IP (including, without limitation, contributions and inventorship).</p></sec><sec id="s3d"><title>Data monitoring procedures</title><p>Each individual trial will follow its own data monitoring procedures. The collaboration plans to update the IPDMA data at regular intervals if further relevant individual trials are completed with available data.</p></sec><sec id="s3e"><title>Risks and benefits</title><p>The main risk for this study is the discovery of discrepant data, or results that are inconsistent with published manuscripts; however, all the studies have been published in peer-reviewed, scientific journals. In addition, this risk will be minimised by careful handling of the data, involvement of two independent statisticians in data analysis, having a unified plan for management of missing data, and the plan for open discussions to resolve any issues regarding any conflicting information. Participation in this study requires prior consent and approval of all trial managers in sharing each study's data and subjecting individual data to reanalysis. There is also a risk of inadequate representation of all trial participants due to authors who do not consent to their data being pooled into the IPDMA.</p><p>The combination of data from multiple, similar trials via an IPDMA can yield more reliable estimates of treatment effects, especially for small subgroups of patients.<xref rid="R29" ref-type="bibr">29–32</xref> The patients enrolled in each of the individual studies may have had particular patient characteristics or exposures that may have affected the effectiveness of the probiotic intervention. In addition, the different studies may have varied in the types of patients they recruited or varied slightly in their recruitment criteria. As a result, in addition to making more definitive conclusions as to whether probiotics are effective for infant colic, this IPDMA will be able to help determine if there are subgroups of infants who might benefit from a probiotic intervention for colic, in general, or to a particular probiotic strain.</p></sec><sec id="s3f"><title>Publication plan</title><p>Each individual trial will have the right to publish its main results before publication of this IPDMA. Study results from this meta-analysis will be reported in a peer-reviewed journal in 2015. Before publication of any IPDMA manuscripts, drafts will be circulated for comment, revision and approval by a nominated representative of each of the participating trials. Publications using these data will be authored on behalf of the IPDMA collaboration, with specific named authors (including a representative of each participating trial, the project coordination team and data management team) according to the amount of contribution to each manuscript, and names of other participating collaborators listed in the Acknowledgements.</p></sec></sec><sec id="s4"><title>Strengths and limitations of the study</title><p>This is the first IPDMA and the most definitive method to assess the effectiveness of <italic>L. reuteri</italic> DSM 17938 in managing infants with colic, and to clarify which subgroups of infants with colic may benefit from probiotics. The study is limited by the number of participating authors who contribute data to the study, and cannot include data from authors who decline participation. The study is also limited by inclusion of studies with differing methods of defining infant colic and measuring outcomes. The collaboration formed through this IPDMA will be the platform to conduct future IPDMAs for the probiotic management and prevention of infant colic.</p></sec><sec sec-type="supplementary-material"><title>Supplementary Material</title><supplementary-material id="d35e342" content-type="local-data"><caption><title>Author's manuscript</title></caption><media mimetype="application" mime-subtype="pdf" xlink:href="bmjopen-2014-006475.draft_revisions.pdf"></media></supplementary-material><supplementary-material id="d35e343" content-type="local-data"><caption><title>Reviewer comments</title></caption><media mimetype="application" mime-subtype="pdf" xlink:href="bmjopen-2014-006475.reviewer_comments.pdf"></media></supplementary-material></sec></body><back><ack><p>The authors thank Mary Ellen Sanders for organising all funding arrangements from ISAPP and for organising the ISAPP meeting in Aberdeen, UK in June 2014.</p></ack><fn-group><fn><p><bold>Contributors:</bold> VS, MDC, FDA and DT conceptualised the study protocol. VS and MDC are the project coordinators of this collaboration. FDA and DT are the data managers of this study. All authors contributed to the design of the study protocol. VS produced the first draft of the manuscript. All authors contributed to the writing of the manuscript and read and approved the final manuscript.</p></fn><fn><p><bold>Funding:</bold> This work was supported by the International Scientific Association for Probiotics and Prebiotics (ISAPP). ISAPP has contributed to the costs of all teleconferences and has facilitated the first meeting for this collaboration in June 2014 in Aberdeen, UK. ISAPP will also offer support for the statistical work involved in this IPDMA. ISAPP has contributed to the fees for submission of this manuscript for publication. Each individual trial has received funding from their own respective funding bodies. VS is supported by a National Health and Medical Research Council Postgraduate Scholarship 607447. The Murdoch Childrens Research Institute is supported by the Victorian Government's Operational Infrastructure Support Program.</p></fn><fn><p><bold>Competing interests:</bold> VS, MDC, FDA, GD, FI, SM, FS, HS and DT have received travel reimbursement to attend the ISAPP meeting in Aberdeen, UK in June 2014. MDC is a board member of the ISAPP and has received grant funding from Nestec; he has served as a paid consultant for Nestle, Mead Johnson and Pfizer Nutrition. FDA and DT will receive funding from ISAPP for their work in the statistical analysis. In the past 5 years, DT has also received travel reimbursement to attend annual ISAPP meetings (2009–2014) and scientific consulting fees (2012).HS and FI served as speakers for BioGaia, the manufacturer of <italic>L. reuteri</italic> DSM 17938. CD received honoraria from Sodilac for a clinical trial.<xref rid="R26" ref-type="bibr">26</xref> FS reports receiving a travel grant from Nestlè Italy; personal fees from Mead Johnson Nutrition, Italy; personal fees from Cana S.A.S. Thessaloniki, Greece; personal fees from Nutricia-Part of Group Danone, Dubai Kuwait; travel grants and other from BioGaia AB, Stockholm I Sweden; personal fees from HiPP GmbH and Co Vertrieb KG Germany; a travel grant from Nestlé France SAS, Paris; travel grants and other from Noos, srl, Roma Italy; personal fees from A. 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