Work pattern causes bias in self-reported activity duration: a randomised study of mechanisms and implications for exposure assessment and epidemiology
Identifieur interne : 000336 ( Main/Corpus ); précédent : 000335; suivant : 000337Work pattern causes bias in self-reported activity duration: a randomised study of mechanisms and implications for exposure assessment and epidemiology
Auteurs : L H Barrero ; J N Katz ; M J Perry ; R. Krishnan ; J H Ware ; J T DennerleinSource :
- Occupational and Environmental Medicine [ 1351-0711 ] ; 2009-01.
Abstract
Background: Self-reported activity duration is used to estimate cumulative exposures in epidemiological research. Objective: The effects of work pattern, self-reported task dullness (a measure of cognitive task demand), and heart rate ratio and perceived physical exertion (measures of physical task demands) on error in task duration estimation were investigated. Methods: 24 participants (23–54 years old, 12 males) were randomly assigned to execute three tasks in either a continuous (three periods of 40 continuous minutes, one for each task) or a discontinuous work pattern (40 min tasks each divided into four periods of 4, 8, 12 and 16 min). Heart rate was measured during tasks. After completing the 2 h work session, subjects reported the perceived duration, dullness and physical exertion for each of the three tasks. Multivariate models were fitted to analyse errors and their absolute value to assess the accuracy in task duration estimation and the mediating role of task demands on the observed results. Results: Participants overestimated the time spent shelving boxes (up to 38%) and filing journals (up to 9%), and underestimated the time typing articles (up to −22%). Over- and underestimates and absolute errors were greater in the discontinuous work pattern group. Only the self-reported task dullness mediated the differences in task duration estimation accuracy between work patterns. Conclusions: Task-related factors can affect self-reported activity duration. Exposure assessment strategies requiring workers to allocate work time to different tasks could result in biased measures of association depending on the demands of the tasks during which the exposure of interest occurs.
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DOI: 10.1136/oem.2007.037291
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Work pattern causes bias in self-reported activity duration: a randomised study of mechanisms and implications for exposure assessment and epidemiology</title><author><name sortKey="Barrero, L H" sort="Barrero, L H" uniqKey="Barrero L" first="L H" last="Barrero">L H Barrero</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>Deparment of Industrial Engineering, Pontificia Universidad Javeriana, Bogotá, Colombia</mods:affiliation></affiliation></author><author><name sortKey="Katz, J N" sort="Katz, J N" uniqKey="Katz J" first="J N" last="Katz">J N Katz</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>Section of Clinical Sciences, Harvard Medical School, Boston, Massachusetts, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>Orthopaedic and Arthritis Center for Outcomes Research, Brigham and Women’s Hospital, Boston, Massachusetts, USA</mods:affiliation></affiliation></author><author><name sortKey="Perry, M J" sort="Perry, M J" uniqKey="Perry M" first="M J" last="Perry">M J Perry</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation></author><author><name sortKey="Krishnan, R" sort="Krishnan, R" uniqKey="Krishnan R" first="R" last="Krishnan">R. Krishnan</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation></author><author><name sortKey="Ware, J H" sort="Ware, J H" uniqKey="Ware J" first="J H" last="Ware">J H Ware</name><affiliation><mods:affiliation>Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation></author><author><name sortKey="Dennerlein, J T" sort="Dennerlein, J T" uniqKey="Dennerlein J" first="J T" last="Dennerlein">J T Dennerlein</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:8C0C59BF4BC6106AAD000E2BC82E07C4314ECC70</idno><date when="2009" year="2009">2009</date><idno type="doi">10.1136/oem.2007.037291</idno><idno type="url">https://api.istex.fr/document/8C0C59BF4BC6106AAD000E2BC82E07C4314ECC70/fulltext/pdf</idno><idno type="wicri:Area/Main/Corpus">000336</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Work pattern causes bias in self-reported activity duration: a randomised study of mechanisms and implications for exposure assessment and epidemiology</title><author><name sortKey="Barrero, L H" sort="Barrero, L H" uniqKey="Barrero L" first="L H" last="Barrero">L H Barrero</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>Deparment of Industrial Engineering, Pontificia Universidad Javeriana, Bogotá, Colombia</mods:affiliation></affiliation></author><author><name sortKey="Katz, J N" sort="Katz, J N" uniqKey="Katz J" first="J N" last="Katz">J N Katz</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>Section of Clinical Sciences, Harvard Medical School, Boston, Massachusetts, USA</mods:affiliation></affiliation><affiliation><mods:affiliation>Orthopaedic and Arthritis Center for Outcomes Research, Brigham and Women’s Hospital, Boston, Massachusetts, USA</mods:affiliation></affiliation></author><author><name sortKey="Perry, M J" sort="Perry, M J" uniqKey="Perry M" first="M J" last="Perry">M J Perry</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation></author><author><name sortKey="Krishnan, R" sort="Krishnan, R" uniqKey="Krishnan R" first="R" last="Krishnan">R. Krishnan</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation></author><author><name sortKey="Ware, J H" sort="Ware, J H" uniqKey="Ware J" first="J H" last="Ware">J H Ware</name><affiliation><mods:affiliation>Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation></author><author><name sortKey="Dennerlein, J T" sort="Dennerlein, J T" uniqKey="Dennerlein J" first="J T" last="Dennerlein">J T Dennerlein</name><affiliation><mods:affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Occupational and Environmental Medicine</title><title level="j" type="abbrev">Occup Environ Med</title><idno type="ISSN">1351-0711</idno><idno type="eISSN">1470-7926</idno><imprint><publisher>BMJ Publishing Group Ltd</publisher><date type="published" when="2009-01">2009-01</date><biblScope unit="volume">66</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="38">38</biblScope></imprint><idno type="ISSN">1351-0711</idno></series><idno type="istex">8C0C59BF4BC6106AAD000E2BC82E07C4314ECC70</idno><idno type="DOI">10.1136/oem.2007.037291</idno><idno type="href">oemed-66-38.pdf</idno><idno type="ArticleID">om37291</idno><idno type="PMID">18805887</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1351-0711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Background: Self-reported activity duration is used to estimate cumulative exposures in epidemiological research. Objective: The effects of work pattern, self-reported task dullness (a measure of cognitive task demand), and heart rate ratio and perceived physical exertion (measures of physical task demands) on error in task duration estimation were investigated. Methods: 24 participants (23–54 years old, 12 males) were randomly assigned to execute three tasks in either a continuous (three periods of 40 continuous minutes, one for each task) or a discontinuous work pattern (40 min tasks each divided into four periods of 4, 8, 12 and 16 min). Heart rate was measured during tasks. After completing the 2 h work session, subjects reported the perceived duration, dullness and physical exertion for each of the three tasks. Multivariate models were fitted to analyse errors and their absolute value to assess the accuracy in task duration estimation and the mediating role of task demands on the observed results. Results: Participants overestimated the time spent shelving boxes (up to 38%) and filing journals (up to 9%), and underestimated the time typing articles (up to −22%). Over- and underestimates and absolute errors were greater in the discontinuous work pattern group. Only the self-reported task dullness mediated the differences in task duration estimation accuracy between work patterns. Conclusions: Task-related factors can affect self-reported activity duration. Exposure assessment strategies requiring workers to allocate work time to different tasks could result in biased measures of association depending on the demands of the tasks during which the exposure of interest occurs.</div></front></TEI><istex><corpusName>bmj</corpusName><author><json:item><name>L H Barrero</name><affiliations><json:string>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</json:string><json:string>Deparment of Industrial Engineering, Pontificia Universidad Javeriana, Bogotá, Colombia</json:string></affiliations></json:item><json:item><name>J N Katz</name><affiliations><json:string>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</json:string><json:string>Section of Clinical Sciences, Harvard Medical School, Boston, Massachusetts, USA</json:string><json:string>Orthopaedic and Arthritis Center for Outcomes Research, Brigham and Women’s Hospital, Boston, Massachusetts, USA</json:string></affiliations></json:item><json:item><name>M J Perry</name><affiliations><json:string>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</json:string></affiliations></json:item><json:item><name>R Krishnan</name><affiliations><json:string>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</json:string></affiliations></json:item><json:item><name>J H Ware</name><affiliations><json:string>Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, USA</json:string></affiliations></json:item><json:item><name>J T Dennerlein</name><affiliations><json:string>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>Original articles</value></json:item></subject><language><json:string>eng</json:string></language><abstract>Background: Self-reported activity duration is used to estimate cumulative exposures in epidemiological research. Objective: The effects of work pattern, self-reported task dullness (a measure of cognitive task demand), and heart rate ratio and perceived physical exertion (measures of physical task demands) on error in task duration estimation were investigated. Methods: 24 participants (23–54 years old, 12 males) were randomly assigned to execute three tasks in either a continuous (three periods of 40 continuous minutes, one for each task) or a discontinuous work pattern (40 min tasks each divided into four periods of 4, 8, 12 and 16 min). Heart rate was measured during tasks. After completing the 2 h work session, subjects reported the perceived duration, dullness and physical exertion for each of the three tasks. Multivariate models were fitted to analyse errors and their absolute value to assess the accuracy in task duration estimation and the mediating role of task demands on the observed results. Results: Participants overestimated the time spent shelving boxes (up to 38%) and filing journals (up to 9%), and underestimated the time typing articles (up to −22%). Over- and underestimates and absolute errors were greater in the discontinuous work pattern group. Only the self-reported task dullness mediated the differences in task duration estimation accuracy between work patterns. Conclusions: Task-related factors can affect self-reported activity duration. Exposure assessment strategies requiring workers to allocate work time to different tasks could result in biased measures of association depending on the demands of the tasks during which the exposure of interest occurs.</abstract><qualityIndicators><score>8</score><pdfVersion>1.2</pdfVersion><pdfPageSize>595.276 x 793.701 pts</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>1</keywordCount><abstractCharCount>1705</abstractCharCount><pdfWordCount>6136</pdfWordCount><pdfCharCount>40347</pdfCharCount><pdfPageCount>7</pdfPageCount><abstractWordCount>253</abstractWordCount></qualityIndicators><title>Work pattern causes bias in self-reported activity duration: a randomised study of mechanisms and implications for exposure assessment and 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Colombia</affiliation></author><author><persName><forename type="first">J N</forename><surname>Katz</surname></persName><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation><affiliation>Section of Clinical Sciences, Harvard Medical School, Boston, Massachusetts, USA</affiliation><affiliation>Orthopaedic and Arthritis Center for Outcomes Research, Brigham and Women’s Hospital, Boston, Massachusetts, USA</affiliation></author><author><persName><forename type="first">M J</forename><surname>Perry</surname></persName><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation></author><author><persName><forename type="first">R</forename><surname>Krishnan</surname></persName><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation></author><author><persName><forename type="first">J H</forename><surname>Ware</surname></persName><affiliation>Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation></author><author><persName><forename type="first">J T</forename><surname>Dennerlein</surname></persName><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation></author></analytic><monogr><title level="j">Occupational and Environmental Medicine</title><title level="j" type="abbrev">Occup Environ Med</title><idno type="JournalID">oem</idno><idno type="pISSN">1351-0711</idno><idno type="eISSN">1470-7926</idno><imprint><publisher>BMJ Publishing Group Ltd</publisher><date type="published" when="2009-01"></date><biblScope unit="volume">66</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="38">38</biblScope></imprint></monogr><idno type="istex">8C0C59BF4BC6106AAD000E2BC82E07C4314ECC70</idno><idno type="DOI">10.1136/oem.2007.037291</idno><idno 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Objective: The effects of work pattern, self-reported task dullness (a measure of cognitive task demand), and heart rate ratio and perceived physical exertion (measures of physical task demands) on error in task duration estimation were investigated. Methods: 24 participants (23–54 years old, 12 males) were randomly assigned to execute three tasks in either a continuous (three periods of 40 continuous minutes, one for each task) or a discontinuous work pattern (40 min tasks each divided into four periods of 4, 8, 12 and 16 min). Heart rate was measured during tasks. After completing the 2 h work session, subjects reported the perceived duration, dullness and physical exertion for each of the three tasks. Multivariate models were fitted to analyse errors and their absolute value to assess the accuracy in task duration estimation and the mediating role of task demands on the observed results. Results: Participants overestimated the time spent shelving boxes (up to 38%) and filing journals (up to 9%), and underestimated the time typing articles (up to −22%). Over- and underestimates and absolute errors were greater in the discontinuous work pattern group. Only the self-reported task dullness mediated the differences in task duration estimation accuracy between work patterns. Conclusions: Task-related factors can affect self-reported activity duration. Exposure assessment strategies requiring workers to allocate work time to different tasks could result in biased measures of association depending on the demands of the tasks during which the exposure of interest occurs.</p></abstract><textClass><keywords scheme="keyword"><list><head>heading</head><item><term>Original articles</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2008-09-19">Created</change><change when="2009-01">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-0-25">References added</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-1-2">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/8C0C59BF4BC6106AAD000E2BC82E07C4314ECC70/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="corpus bmj" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="no"</istex:xmlDeclaration><istex:docType PUBLIC="-//NLM//DTD Journal Archiving and Interchange DTD v2.3 20070202//EN" URI="archivearticle.dtd" name="istex:docType"></istex:docType><istex:document><article article-type="research-article" xml:lang="EN"><front><journal-meta><journal-id journal-id-type="hwp">oemed</journal-id><journal-id journal-id-type="nlm-ta">Occup Environ Med</journal-id><journal-id journal-id-type="publisher-id">oem</journal-id><journal-title>Occupational and Environmental Medicine</journal-title><abbrev-journal-title abbrev-type="publisher">Occup Environ Med</abbrev-journal-title><issn pub-type="ppub">1351-0711</issn><issn pub-type="epub">1470-7926</issn><publisher><publisher-name>BMJ Publishing Group Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">om37291</article-id><article-id pub-id-type="doi">10.1136/oem.2007.037291</article-id><article-id pub-id-type="other">oemed;66/1/38</article-id><article-id pub-id-type="other">oemed;oem.2007.037291</article-id><article-id pub-id-type="pmid">18805887</article-id><article-id pub-id-type="other">38</article-id><article-id pub-id-type="other">oem.2007.037291</article-id><article-categories><subj-group subj-group-type="heading"><subject content-type="original">Original articles</subject></subj-group></article-categories><title-group><article-title>Work pattern causes bias in self-reported activity duration: a randomised study of mechanisms and implications for exposure assessment and epidemiology</article-title><alt-title alt-title-type="running-head">Original article</alt-title></title-group><contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Barrero</surname><given-names>L H</given-names></name><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="aff" rid="aff2">2</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Katz</surname><given-names>J N</given-names></name><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="aff" rid="aff3">3</xref><xref ref-type="aff" rid="aff4">4</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Perry</surname><given-names>M J</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Krishnan</surname><given-names>R</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Ware</surname><given-names>J H</given-names></name><xref ref-type="aff" rid="aff5">5</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Dennerlein</surname><given-names>J T</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib></contrib-group><aff id="aff1"><label>1</label><addr-line>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</addr-line></aff><aff id="aff2"><label>2</label><addr-line>Deparment of Industrial Engineering, Pontificia Universidad Javeriana, Bogotá, Colombia</addr-line></aff><aff id="aff3"><label>3</label><addr-line>Section of Clinical Sciences, Harvard Medical School, Boston, Massachusetts, USA</addr-line></aff><aff id="aff4"><label>4</label><addr-line>Orthopaedic and Arthritis Center for Outcomes Research, Brigham and Women’s Hospital, Boston, Massachusetts, USA</addr-line></aff><aff id="aff5"><label>5</label><addr-line>Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, USA</addr-line></aff><author-notes><corresp>Dr Jack T Dennerlein, Harvard School of Public Health, Landmark Center, 3rd Floor, East, Room 49, 401 Park Drive, Boston, MA 02215, USA; <email xlink:type="simple">jax@hsph.harvard.edu</email></corresp></author-notes><pub-date pub-type="ppub"><month>1</month><year>2009</year></pub-date><pub-date pub-type="epub-original"><day>19</day><month>9</month><year>2008</year></pub-date><pub-date pub-type="epub"><day>19</day><month>9</month><year>2008</year></pub-date><volume>66</volume><volume-id pub-id-type="other">66</volume-id><volume-id pub-id-type="other">66</volume-id><issue>1</issue><issue-id pub-id-type="other">oemed;66/1</issue-id><issue-id pub-id-type="other">1</issue-id><issue-id pub-id-type="other">66/1</issue-id><fpage>38</fpage><history><date date-type="accepted"><day>20</day><month>6</month><year>2008</year></date></history><permissions><copyright-statement>2009 BMJ Publishing Group</copyright-statement><copyright-year>2009</copyright-year></permissions><self-uri content-type="pdf" xlink:role="full-text" xlink:href="oemed-66-38.pdf"></self-uri><abstract><sec><title>Background:</title><p>Self-reported activity duration is used to estimate cumulative exposures in epidemiological research.</p></sec><sec><title>Objective:</title><p>The effects of work pattern, self-reported task dullness (a measure of cognitive task demand), and heart rate ratio and perceived physical exertion (measures of physical task demands) on error in task duration estimation were investigated.</p></sec><sec><title>Methods:</title><p>24 participants (23–54 years old, 12 males) were randomly assigned to execute three tasks in either a continuous (three periods of 40 continuous minutes, one for each task) or a discontinuous work pattern (40 min tasks each divided into four periods of 4, 8, 12 and 16 min). Heart rate was measured during tasks. After completing the 2 h work session, subjects reported the perceived duration, dullness and physical exertion for each of the three tasks. Multivariate models were fitted to analyse errors and their absolute value to assess the accuracy in task duration estimation and the mediating role of task demands on the observed results.</p></sec><sec><title>Results:</title><p>Participants overestimated the time spent shelving boxes (up to 38%) and filing journals (up to 9%), and underestimated the time typing articles (up to −22%). Over- and underestimates and absolute errors were greater in the discontinuous work pattern group. Only the self-reported task dullness mediated the differences in task duration estimation accuracy between work patterns.</p></sec><sec><title>Conclusions:</title><p>Task-related factors can affect self-reported activity duration. Exposure assessment strategies requiring workers to allocate work time to different tasks could result in biased measures of association depending on the demands of the tasks during which the exposure of interest occurs.</p></sec></abstract></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Work pattern causes bias in self-reported activity duration: a randomised study of mechanisms and implications for exposure assessment and epidemiology</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>Work pattern causes bias in self-reported activity duration: a randomised study of mechanisms and implications for exposure assessment and epidemiology</title></titleInfo><name type="personal"><namePart type="given">L H</namePart><namePart type="family">Barrero</namePart><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation><affiliation>Deparment of Industrial Engineering, Pontificia Universidad Javeriana, Bogotá, Colombia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J N</namePart><namePart type="family">Katz</namePart><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation><affiliation>Section of Clinical Sciences, Harvard Medical School, Boston, Massachusetts, USA</affiliation><affiliation>Orthopaedic and Arthritis Center for Outcomes Research, Brigham and Women’s Hospital, Boston, Massachusetts, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M J</namePart><namePart type="family">Perry</namePart><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">R</namePart><namePart type="family">Krishnan</namePart><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J H</namePart><namePart type="family">Ware</namePart><affiliation>Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J T</namePart><namePart type="family">Dennerlein</namePart><affiliation>Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article">research-article</genre><subject><genre>heading</genre><topic>Original articles</topic></subject><originInfo><publisher>BMJ Publishing Group Ltd</publisher><dateIssued encoding="w3cdtf">2009-01</dateIssued><dateCreated encoding="w3cdtf">2008-09-19</dateCreated><copyrightDate encoding="w3cdtf">2009</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract>Background: Self-reported activity duration is used to estimate cumulative exposures in epidemiological research. Objective: The effects of work pattern, self-reported task dullness (a measure of cognitive task demand), and heart rate ratio and perceived physical exertion (measures of physical task demands) on error in task duration estimation were investigated. Methods: 24 participants (23–54 years old, 12 males) were randomly assigned to execute three tasks in either a continuous (three periods of 40 continuous minutes, one for each task) or a discontinuous work pattern (40 min tasks each divided into four periods of 4, 8, 12 and 16 min). Heart rate was measured during tasks. After completing the 2 h work session, subjects reported the perceived duration, dullness and physical exertion for each of the three tasks. Multivariate models were fitted to analyse errors and their absolute value to assess the accuracy in task duration estimation and the mediating role of task demands on the observed results. Results: Participants overestimated the time spent shelving boxes (up to 38%) and filing journals (up to 9%), and underestimated the time typing articles (up to −22%). Over- and underestimates and absolute errors were greater in the discontinuous work pattern group. Only the self-reported task dullness mediated the differences in task duration estimation accuracy between work patterns. Conclusions: Task-related factors can affect self-reported activity duration. Exposure assessment strategies requiring workers to allocate work time to different tasks could result in biased measures of association depending on the demands of the tasks during which the exposure of interest occurs.</abstract><relatedItem type="host"><titleInfo><title>Occupational and Environmental Medicine</title></titleInfo><titleInfo type="abbreviated"><title>Occup Environ Med</title></titleInfo><identifier type="ISSN">1351-0711</identifier><identifier type="eISSN">1470-7926</identifier><identifier type="JournalID">oem</identifier><identifier type="JournalID-hwp">oemed</identifier><identifier type="JournalID-nlm-ta">Occup Environ Med</identifier><part><date>2009</date><detail type="volume"><caption>vol.</caption><number>66</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>38</start></extent></part></relatedItem><identifier type="istex">8C0C59BF4BC6106AAD000E2BC82E07C4314ECC70</identifier><identifier type="DOI">10.1136/oem.2007.037291</identifier><identifier type="href">oemed-66-38.pdf</identifier><identifier type="ArticleID">om37291</identifier><identifier type="PMID">18805887</identifier><accessCondition type="use and reproduction" contentType="Copyright">2009 BMJ Publishing Group</accessCondition><recordInfo><recordContentSource>BMJ</recordContentSource></recordInfo></mods></metadata><annexes><json:item><original>true</original><mimetype>image/jpeg</mimetype><extension>jpeg</extension><uri>https://api.istex.fr/document/8C0C59BF4BC6106AAD000E2BC82E07C4314ECC70/annexes/jpeg</uri></json:item></annexes><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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