Table 1. Participant characteristics^a.

	All sites	(A) Qualitative (QUAL) sample	(B) Non-QUAL sample at QUAL sites	Difference [(A) vs. (B), Fisher's P]	(C) Non-QUAL sample at all sites	Difference [(A) vs. (C) Fisher's P]
Participants enrolled, N	2629	214	907		2415
Age, years x median (mean, min–max)	26 (27.2, 18–45)	26 (26.4, 18–42)	27 (27.5, 18–45)	0.012	26 (27.3, 18–45)	0.126
Currently married	1074 (41%)	96 (45%)	423 (47%)	0.648	978 (41%)	0.218
Highest level of education
No schooling	23 (1%)	5 (2%)	8 (1%)	0.114	18 (1%)	0.002
Primary school (partial and complete)	381 (14%)	45 (21%)	191 (21%)		336 (14%)
Secondary school (partial and complete)	2070 (79%)	156 (73%)	646 (71%)		1914 (79%)
Attended college or university	155 (6%)	8 (4%)	62 (7%)		147 (6%)
Had a primary sex partner during the past 3 months	2616 (100%)	213 (100%)	904 (100%)	0.572	2403 (100%)	1.000
Had any other sex partners in the past 3 months	439 (17%)	36 (17%)	162 (18%)	0.784	403 (17%)	0.933
Condom used in the last act of vaginal sex	1501 (58%)	101 (47%)	444 (49%)	0.205	1407 (58%)	0.001
Had anal sex in the past 3 months	54 (2%)	2 (1%)	17 (2%)	0.555	52 (2%)	0.316
Primary partner knows of participation in the trial	1972 (75%)	153 (72%)	605 (67%)	0.346	1819 (76%)	0.277
Primary partner knows has been asked to use ring	1680 (64%)	125 (59%)	504 (56%)	0.444	1555 (65%)	0.171
Primary partner HIV status
HIV positive	35 (1%)	4 (2%)	14 (2%)	0.133	31 (1%)	0.321
HIV negative	1444 (55%)	125 (59%)	465 (51%)		1319 (55%)
Participant does not know	1137 (43%)	84 (39%)	425 (47%)		1053 (44%)
Had same primary partner for last 3 months	2538 (97%)	206 (97%)	859 (95%)	0.367	2332 (97%)	0.833
Number of vaginal sex acts in the past 3 monthsb	20 (26.5, 0–99)	15.5 (23.2, 1–99)	24 (26, 0–99)	0.036	20 (26.8, 0–99)	0.118

^aBackground and demographic characteristics of participants were summarized in SAS (v.9; SAS Institute Inc., Cary, North Carolina, USA), and statistically compared using Wilcoxon and Fishers exact tests.

^bMedian (mean, min–max).