Sample size determination by using prevalence of mothers having circumcised daughters’ (outcome variable) | ||
Variables | Assumptions | N |
Prevalence of mothers who had at least one circumcised daughter | P = 23 %, d = 0.05, CI = 95 % | \( n=\frac{1.96^2*0.23*0.77}{0.05^2}=272 \) |
Sample size determination considering factors | ||
Factors | Assumptions | n |
Knowledge about ill effect of FGM | OR = 0.02, P = 15 %, Ratio 1:1, Power = 80 %, CI = 95 % | 128 |
Mothers circumcision status | OR = 2, P = 49.6 %, Ratio 1:1, Power = 80 %, CI = 95 % | 296 |