. Author manuscript; available in PMC: 2009 Jan 23.

Published in final edited form as: Ann Appl Stat. 2008;2(4):1409–1431. doi: 10.1214/08-AOAS193

Table 2.

VAX004: Summary of the posterior distributions of the transmission probability and the vaccine efficacy per infectious sexual contact for the overall study population and by baseline risk level, compared to the standard analysis

			p		VE (Bayesian)		VE (Cox^a)

Risk level	Total^b	Infected	Median	95% C.S.	Median	95% C.S.	Estimate	95% C.I.
Overall	8772	368	0.0056	0.0044, 0.0071	0.069	-0.15, 0.26	0.06	-0.17, 0.24
Low	3605	57	0.0020	0.0010, 0.0036	-0.23	-1.48, 0.35	-0.48	-1.93, 0.26
Middle	4546	229	0.0054	0.0041, 0.0071	0.02	-0.28, 0.25	0.03	-0.25, 0.25
High	621	82	0.020	0.013, 0.030	0.56	0.22, 0.75	0.43	0.04, 0.66

Results based on Cox proportional hazards model in Gurwith et al. (2005).

Total number of six-month intervals.