Article

Participant compliance is an important issue in studies using accelerometers.
Some participants wear the accelerometer for the duration specified by the
researchers but many do not. We investigated a range of demographic factors
associated with participant compliance in obtaining analyzable accelerometer
data. A total of 3601 participants (aged 47.6+/-13.1 years, 44.6% male) were
included. They were asked to wear an accelerometer (ActiGraph) for four
consecutive days after completing a household survey during March 2009-January
2011 in Hong Kong. Participants wore the accelerometer on average for 13.9h in a
24-h day. No significant difference was found between males and females (p=0.38).
Using log-linear regression, it was found that older participants (0.5% more
wearing hours for each year of age, p<0.001), those with full-time job (p<0.01),
with tertiary education (p<0.01), non-smokers (p<0.01) and with high
self-reported health (p<0.05) wore the accelerometer for more hours. These
results provide details for estimating compliance rates for samples with
different characteristics and thus sample size calculation to account for
participant compliance.
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Langue : ANGLAIS