Risk behavior among women enrolled in a randomized controlled efficacy trial of an adenoviral vector vaccine to prevent HIV acquisition. Report of risk behavior, HIV incidence, and pregnancy rates among women participating in the STEP study, which is a phase IIB trial of vaccine in HIV-negative individuals who were at high risk of HIV-1. Women were from North American, and from Caribbean and South America (CSA) sites. Risk behavior was collected at screening and 6-month intervals. Differences in characteristics between groups were tested with chi-square, two-sided Fisher's exact tests, and Wilcoxon rank-sum tests. Generalized estimating equation models were used to assess behavioral change.
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