We estimated that the sample size needed to detect at least a
2000-step difference in means was 14 participants per group,
or 42 participants total, assuming a within-participant SD of
1800 steps/day, 2-sided alpha of 0.05, and beta of 0.8.
Allowing for 12% attrition, target enrollment was 48 participants. Our trial aimed to detect an increase of 2000 steps/
day, given that this was previously associated with a10%
relative reduction in the long-term incidence of CVD,
17
and is
generally felt to represent a clinically significant increase.
However, the selection of 2000 steps/day does not signify
that a smaller increase in physical activity could not also be
clinically significant
We estimated that the sample size needed to detect at least a2000-step difference in means was 14 participants per group,or 42 participants total, assuming a within-participant SD of1800 steps/day, 2-sided alpha of 0.05, and beta of 0.8.Allowing for 12% attrition, target enrollment was 48 participants. Our trial aimed to detect an increase of 2000 steps/day, given that this was previously associated with a10%relative reduction in the long-term incidence of CVD,17and isgenerally felt to represent a clinically significant increase.However, the selection of 2000 steps/day does not signifythat a smaller increase in physical activity could not also beclinically significant
การแปล กรุณารอสักครู่..