Sample size calculation
The sample size was calculated based on the main variable of the study (social support) according to Khanzadeh and Moghaddam Tabrizi [
μ1: mean difference of the social support in the intervention group (11.25), μ2: mean difference of the social support in the control group (4.95), SD1: standard deviation of the social support before intervention (14.21), and SD2: standard deviation of the social support after intervention (