Table 2.

Post-intervention findings for unprotected penetrative intercourse (UPI)

Effect	Model component
	Logistic OR (95% CI)	Negative binomial IRR (95% CI)
Group: Intervention versus comparison	1.128 (0.310, 4.105)	1.273 (0.856, 1.892)
Baseline UPI	0.897 (0.729, 1.103)	1.019 (1.010, 1.029)**
Intervention × Baseline UPI	1.065 (0.861, 1.317)	0.987 (0.975, 0.998)*

Results originate from a zero-inflated negative binomial regression analysis conducted in Stata 9.1 (N = 247). Group is coded as 0 = comparison group member; 1 = intervention group member. OR odds ratio per unit change in the explanatory variable for always zero class of participants. IRR incidence rate ratio per unit change in the explanatory variable for the not always zero class of participants

* p < 0.05; ** p < 0.01