Comparative effectiveness of congregation- versus clinic-based approach to prevention of mother-to-child HIV transmission: study protocol for a cluster randomized controlled trial

Table 2 Minimum detectable intervention group rate (2-sided test, 5% significance level)

Cluster size (total sample size)	Control group rate
	0.15			0.20			0.25
	ICC			ICC			ICC
	0.002	0.05	0.1	0.002	0.05	0.1	0.002	0.05	0.1
3 (120)	0.37	0.38	0.39	0.43	0.44	0.45	0.49	0.50	0.51
4 (160)	0.34	0.35	0.36	0.40	0.41	0.43	0.46	0.47	0.49
5 (200)	0.31	0.33	0.35	0.38	0.39	0.41	0.43	0.45	0.47
10 (400)	0.26	0.29	0.31	0.32	0.35	0.37	0.38	0.41	0.43
50 (2000)	0.20	0.24	0.27	0.25	0.30	0.33	0.31	0.36	0.39

ISSN: 1748-5908