Table 1.

Sample size calculation for the second objective.

Variable	CI	Power	Percentage outcome among Exposed	AOR	Sample size	Non-response rate 10%	Total sample size	References
Discussion with partner about dual contraceptive use	95%	80%	28.57%	7.84	42	4	46	[14]
Pregnancy since HIV diagnosis	95%	80%	20.5%	2.05	342	34	376	[13]

The final sample size was 556.