Table 3.

Sample size power calculations

k	HIV incidence universal (%)	HIV incidence targeted (%)	No. of women per clinic	No. of clinics per arm	Total no. of women
0.2	4	2	50	27	2700
0.2	4	2	100	15	3000
0.2	4	2	150	12	3600
0.2	4	2	200	10	4000
0.2	4	2	250	9	4500
0.2	4	2	300	8	4800
0.2	4	1.3	200	6	2400