Appendix A3.

Effects of any incentive on number of clients in week prior to visit

	ITT		IPW
	(1)	(2)	(3)	(4)
Any conditional economic incentive (CEI)	0.355 (0.478)	0.498 (0.527)	0.184 (0.529)	0.332 (0.558)
Follow-up visits¶	−0.268* (0.146)	−0.326** (0.156)	−0.336** (0.156)	−0.345** (0.166)
Observations	427	427	346	346
Covariates	N	Y	N	Y
Mean of dependent variable at baseline (control)	3.5		3.7

Notes: Table presents effect of any CEI on the number of commercial sex clients (in week prior to study visit) at months 6 and 12 (during the active phase) and at 18 months (once incentives were removed), with robust standard errors in parentheses ():

^*p<0.1;

^**p<0.05;

^***p<0.01.

Any conditional economic incentive (CEI) includes: medium (M) or high (H) incentive to stay free of new curable STIs or medium incentive for study visits only (Mv).

Regressions in columns (2) and (4) control for the covariates presented in Table 1: age, schooling, marital status, age of first sexual contact, having received a previous HIV test at baseline, having received previous STI test other than HIV at baseline.

^¶Follow-up visits coded as: 0=baseline, 1=six-month visit, 2=twelve-month visit, and 3=eighteen-month visit.