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Investigating obesity as a risk factor for influenza‐like illness during the 2009 H1N1 influenza pandemic using the Health Survey for England

Identifieur interne : 000868 ( Main/Exploration ); précédent : 000867; suivant : 000869

Investigating obesity as a risk factor for influenza‐like illness during the 2009 H1N1 influenza pandemic using the Health Survey for England

Auteurs : Rachel Murphy ; Ellen B. Fragaszy ; Andrew C. Hayward ; Charlotte Warren-Gash

Source :

RBID : PMC:5155645

Descripteurs français

English descriptors

Abstract

Background

Following the 2009 H1N1 influenza pandemic, obesity was shown to be associated with severe influenza outcomes. It remains unclear whether obesity was a risk factor for milder influenza‐like illness (ILI).

Objectives

To determine whether obesity was associated with an increased risk of self‐reported ILI during the 2009 H1N1 influenza pandemic using Health Survey for England (HSE) 2010 cross‐sectional data.

Methods

This study used HSE data collected from English households between January and December 2010. Weight and height measurements were taken by trained fieldworkers to determine obesity. ILI was defined as a positive response to the question “Have you had a flu‐like illness where you felt feverish and had a cough or sore throat?” with illness occurring between May and December 2009. Multivariable logistic regression was used to evaluate the association between obesity and ILI.

Results

The study comprised 8407 participants (6984 adults, 1436 children), among whom 24.7% (95% CI: 23.6–25.9) were classified as obese. Of obese participants, 12.8% (95% CI: 11.1–14.8) reported ILI compared to 11.8% (95% CI: 10.8–12.8) of non‐obese participants. The adjusted OR for ILI associated with obesity was 1.16 (95% CI: 0.98–1.38, P=.093). For adults and children, the adjusted ORs were 1.16 (95% CI: 0.97–1.38, P=.101) and 1.26 (95% CI: 0.72–2.21, P=.422), respectively.

Conclusion

Household survey data showed no evidence that obesity was associated with an increase in self‐reported ILI during the 2009 H1N1 influenza pandemic in England. Further studies using active prospective ILI surveillance combined with laboratory reporting would reduce bias and improve accuracy of outcome measurements.


Url:
DOI: 10.1111/irv.12420
PubMed: 27480326
PubMed Central: 5155645


Affiliations:


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<div type="abstract" xml:lang="en">
<sec id="irv12420-sec-0001">
<title>Background</title>
<p>Following the 2009 H1N1 influenza pandemic, obesity was shown to be associated with severe influenza outcomes. It remains unclear whether obesity was a risk factor for milder influenza‐like illness (
<styled-content style="fixed-case">ILI</styled-content>
).</p>
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<sec id="irv12420-sec-0002">
<title>Objectives</title>
<p>To determine whether obesity was associated with an increased risk of self‐reported
<styled-content style="fixed-case">ILI</styled-content>
during the 2009 H1N1 influenza pandemic using Health Survey for England (
<styled-content style="fixed-case">HSE</styled-content>
) 2010 cross‐sectional data.</p>
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<title>Methods</title>
<p>This study used
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data collected from English households between January and December 2010. Weight and height measurements were taken by trained fieldworkers to determine obesity.
<styled-content style="fixed-case">ILI</styled-content>
was defined as a positive response to the question “Have you had a flu‐like illness where you felt feverish and had a cough or sore throat?” with illness occurring between May and December 2009. Multivariable logistic regression was used to evaluate the association between obesity and
<styled-content style="fixed-case">ILI</styled-content>
.</p>
</sec>
<sec id="irv12420-sec-0004">
<title>Results</title>
<p>The study comprised 8407 participants (6984 adults, 1436 children), among whom 24.7% (95% CI: 23.6–25.9) were classified as obese. Of obese participants, 12.8% (95% CI: 11.1–14.8) reported
<styled-content style="fixed-case">ILI</styled-content>
compared to 11.8% (95% CI: 10.8–12.8) of non‐obese participants. The adjusted
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<styled-content style="fixed-case">OR</styled-content>
s were 1.16 (95% CI: 0.97–1.38,
<italic>P</italic>
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<p>Household survey data showed no evidence that obesity was associated with an increase in self‐reported
<styled-content style="fixed-case">ILI</styled-content>
during the 2009 H1N1 influenza pandemic in England. Further studies using active prospective
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surveillance combined with laboratory reporting would reduce bias and improve accuracy of outcome measurements.</p>
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