Table 2.

Estimated model parameters and derived probabilities/proportions for the outcome, unprotected sex with a male in the past 6 months. Percent change due to study participation is computed from equation (2) in the manuscript.

		Estimate (95% confidence interval)
Parameter estimates	α0	-0.186 (-0.34,-0.11)
	α1	1.91 (1.68,2.03)
	α2	-0.036 (-0.14,0.019)
Observed prevalence at baseline		0.96 (0.95, 0.97)
Estimated pre-study probability1		0.75 (0.74,0.76)
Estimated on-study probability2		0.74 (0.71,0.77)
% of change from baseline due to study		4.4% (-10%, 17%)

¹estimated as $\frac{e^{{\alpha }_0}(1+e^{{\alpha }_0+{\alpha }_1})}{1+2e^{{\alpha }_0}+e^{2{\alpha }_0+{\alpha }_1}}$ (see appendix)

²estimated as $\frac{e^{{\alpha }_0+{\alpha }_2}(1+e^{{\alpha }_0+{\alpha }_1+{\alpha }_2})}{1+2e^{{\alpha }_0+{\alpha }_2}+e^{2{\alpha }_0+{\alpha }_1+2{\alpha }_2}}$ (see appendix)