Table 2.

Risk for any STI (HIV, gonorrhea, Chlamydia)

Baseline Sexual Risk Behaviors	aOR (95% CI)	p-value
Frequency of alcohol use†
Never had alcohol
Male	REF
Female	REF
Used alcohol less than 1 time a week
Male	.190 (.050, .725)	.015
Female	3.76 (1.30, 10.9)	.014
Used alcohol greater than 1 time a week
Male	.244 (.061, .980)	.047
Female	1.37 (.338, 5.55)	.661
Protected sex with casual partners in the last 3 months
Regular partner only
Had protected sex half the time or greater with casual partner/s	REF
14–16	6.19 (2.58, 14.9)	.000
17–19	3.54 (2.07, 6.04)	.000
20–24	2.02 (1.21, 3.36)	.007
25–29	1.15 (.502, 2.65)	.738
Had protected sex less than half the time with at least one casual partner
14–16	22.8 (4.41, 117.5)	.000
17–19	6.59 (2.32, 18.7)	.014
20–24	1.91 (.741, 4.90)	.181
25–29	.552 (.129, 2.36)	.661
Had any sex drunk or high in last 3 mos.	1.32 (.755, 2.34)	.324
Age (14–16, 17–19, 20–24, 25–29)	.938 (.740, 1.19)	.594
Female	.101 (.029, .352)	.000

Note: A multiple logistic regression model using general estimating equation methods was constructed by first including independent variables with the strongest associations with baseline STI and then adding or removing variables that improved model fit (quasi-likelihood under the independence assumption model criterion). Multicollinearity and goodness of fit were examined for the final model. Hosmer and Lemeshow’s goodness-of-fit test indicated that the model fits the data well (p = .612).

aOR: adjusted odds ratio, CI: Confidence Interval.

^†For this variable, frequency of alcohol use was assessed by asking, “During the past 12 months, how often did you drink alcoholic beverages?” Response options were: “None,” “Once a month or less,” “2–3 days a month,” “About once a week,” “2–3 days a week,” “4–6 days a week” and “Everyday.” The distribution of responses and association with STIs informed the categorization at less/more than weekly alcohol use.