Sample size
The sample size was determined based on BMI (mean=25.1 and SD= 5.1) as
the primary outcome obtained from the study by Kord Varkaneh et al.29 in women referred to health centers affiliated to
Tehran University of Medical Sciences, Iran. The sample size was
computed using the following formula: N=[
(z1-α/2)2×sd2]/d2(α= 0.05, confidence level of 95% and d= 2%) as 250 subjects.
Considering the withdrawal rate of 20%, 300 subjects were recruited.