The sample size calculation of logi

The sample size calculation of logistic regression analysis
was applied to calculate the required number of participants
[16], by using distance from home to health facility as
the main independent variable of interest. The event rate of
patients who delayed seeking treatment that had a distance
of less than 3 km was 38.1% (P1 = 0.38), 61.9% (P2 = 0.62)
was the event rate of patients who delayed seeking treatment
that had distance of more than 3 km, and 31.0%
(B = 0.31) was the proportion of patients who delayed
seeking treatment that had distance of more than 3 km
of the overall patients [17]. All of these proportions were
taken into the formula for calculating sample size. By
defining the power of the test at 90%, with 0.05% as a significance
level, the minimum sample size was calculated
as 456, after adjusting for variance and design effect.