Journal
BMJ OPEN
Volume 3, Issue 3, Pages -Publisher
BMJ PUBLISHING GROUP
DOI: 10.1136/bmjopen-2012-002290
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Funding
- Wellcome Trust [084686/Z/08/A]
- UK Medical Research Council [G0400546]
- Department of Health's National Institute for Health Research Biomedical Research Centres funding scheme
- Economic and Social Research Council
- consortium of government departments
- Economic and Social Research Council [ES/G040923/1] Funding Source: researchfish
- Medical Research Council [G0400546] Funding Source: researchfish
- MRC [G0400546] Funding Source: UKRI
- Wellcome Trust [084686/Z/08/A] Funding Source: Wellcome Trust
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Objectives: To investigate the biological, social, behavioural and environmental factors associated with non-consent, and non-return of reliable accelerometer data (>= 2 days lasting >= 10 h/day), in a UK-wide postal study of children's activity. Design: Nationally representative prospective cohort study. Setting: Children born across the UK, between 2000 and 2002. Participants: 13 681 7 to 8-year-old singleton children who were invited to wear an accelerometer on their right hip for 7 consecutive days. Consenting families were posted an Actigraph GT1M accelerometer and asked to return it by post. Primary outcome measures: Study consent and reliable accelerometer data acquisition. Results: Consent was obtained for 12 872 (94.5%) interviewed singletons, of whom 6497 (50.5%) returned reliable accelerometer data. Consent was less likely for children with a limiting illness or disability, children who did not have people smoking near them, children who had access to a garden, and those who lived in Northern Ireland. From those who consented, reliable accelerometer data were less likely to be acquired from children who: were boys; overweight/obese; of white, mixed or 'other' ethnicity; had an illness or disability limiting daily activity; whose mothers did not have a degree; who lived in rented accommodation; who exercised once a week or less; who had been breastfed; were from disadvantaged wards; had younger mothers or lone mothers; or were from households with just one, or more than three children. Conclusions: Studies need to encourage consent and reliable data return in the wide range of groups we have identified to improve response and reduce non-response bias. Additional efforts targeted at such children should increase study consent and data acquisition while also reducing non-response bias. Adjustment must be made for missing data that account for missing data as a non-random event.
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