Table 2.

Sampling strategy and sample size calculations for each Integra research component

Research Component	Sampling strategy	Key indicators used in sample size calculation	Adjustments to sample calculation	Model 1. Kenya FP	Model 2. Kenya PNC	Model 2. Swaziland PNC
Sampling of facilities	Theoretical sampling to point of saturation within province	4 criteria: high client load; minimum of 2 FP providers; range of SRH services available; no current provision of SRH-HIV integration	n/a	12 facilities: 6 Intervention and 6 Comparison	12 facilities: 6 Intervention and 6 Comparison	8 facilities: 4 Intervention and 4 Comparison*
HFAs: Facility inventory				1 per facility	1 per facility	1 per facility
HFAs: Client exit interviews & linked observations of consultations	Consecutive sample and saturation	Quality of Care analysis 6 CPIs	No	18 per facility: 6 new clients, 6 repeat clients and 6 clients switching FP method	6 within 48 hours postpartum 6 at one week and 6 at 6 weeks per facility	6 within 48 hours postpartum 6 at one week and 6 at 6 weeks
HFAs: Structured interviews with providers	Convenience	All providers working in MCH-FP units	No	3-6 providers per facility	3-6 providers per facility	3-6 providers per facility
HFAs: Client flow assessment	Census over 5 days based on existing client load		No	50 – 200 clients per day	50 – 200 clients per day	50 – 200 clients per day
Cohort	Consecutive sample of female clients (recruited if within 12 weeks post-partum in PNC facilities)	Kenya: 80% power to detect a 5% increase in condom use, among all women in PNC and those using other contraceptive methods in FP facilities.	1952 clients: 976 from Intervention and 976 from Comparison facilities
	Swaziland: To detect a 7% increase in condom use among PNC clients.	30% loss to follow up; over-sampling of HIV-positive clients until min of 400 in Intervention & Comparison facilities	1978 clients: 989 from Intervention and 989 from Comparison facilities
Household survey	3-stage cluster survey design, for random selection of EAs, households and individuals	80% power to detect 10% increase in % of women who have ever used study facility.	Design effect of 2.0	1632 (816 male; 816 female) within 10km catchment area of FP facilities	n/a	816 (408 male; 408 female) within 10km catchment area of PNC facilities
Qualitative – in-depth interviews
Providers	Convenience sampling			1-3 providers per facility	1-3 providers per facility	1-3 providers per facility
Cohort clients	Purposive sampling to reflect issues emerging from quantitative data		25 HIV-positive clients; and 25 other clients	25 HIV-positive clients; and 25 other clients	25 HIV-positive clients; and 25 other clients
Community members	Purposive sampling to reflect issues emerging from quantitative data		20 men	n/a	20 men

* 2 facilities subsequently added due to lower than expected client load at comparison sites.