Sample size calculation
The sample size for each group was calculated based on the results of a previous similar study [
Where α = 0.01, β = 0.1, µ1 = 1.4, µ2 = 4.4, S1 = 4.2, and S2 = 0.4, and n = 31. We added 5% for the dropout and the total number of women in each group was calculated to be 32.