Table 3.

Baseline Characteristics and Behaviors⁺ of Participants in Optimization Trial 1 and 2

	Optimization Trial 1 (N = 5,880)		Optimization Trial 2 (N = 3,551)
Demographics	n	%	n	%
Age
18	3,997	68	2,172	61
19	470	8	388	11
20	180	3	85	2
≥ 21	883	15	301	8
Sex
Female	3,335	58	1,882	53
Male	2,172	37	1,038	29
Other	23	.40	26	.73
Sexual Orientation
Heterosexual	5,114	87	2,655	75
Non-heterosexual	374	6	272	8
Race
White	2,775	47	1,718	48
Black	843	14	342	10
Other	771	13	637	18
Hispanic	1,746	30	1,040	29
Housing
On campus	3,104	53	1,489	42
Off campus	2,371	40	1,272	36
Engaged in campus activities	1,745	30	1,342	38
Behaviors
Alcohol Use
Never	1,723	29	1,105	31
Used, but not in past 30 days	1,321	22	763	21
Any use in past 30 days	2,182	37	979	28
Sex
Never	2,030	35	1,208	34
Not in the past 30 days	1,051	18	535	15
Any sex in past 30 days	2,108	36	1,050	30
Hookup
Never	3,288	56	1,902	54
Not in the past 30 days	1,109	19	482	14
Any hookup in past 30 days	799	14	404	11
STI Test in past 6 months	917	16	476	13

⁺Note: Participants did not provide data for all variables, so sample size varies