Table 1.

Description of scales and single item indicators included in the WAF

Scale/Item	Number of items	Sample included	Description
Self-Efficacy	7	All	Assesses how confident adolescents are in acting certain ways in hypothetical sexual situations (e.g., “how confident are you that you can talk with a sexual partner about condom use).” Response options are on a Likert- type scale ranging from 0 (very sure I can’t) to 3 (very sure I can). An average score is calculated across the seven items with higher scores indicative of greater self-efficacy.
Sexual Relations and Violence	4	All	Assesses how much adolescents agree with statements on beliefs about violence in relationships (e.g., “beating up a woman is a good sign that a man loves her”). Responses are on a Likert-type scale ranging from 0 (strongly disagree) to 3 (strongly agree). An average sexual relations and violence score is calculated across the four items with higher scores indicating stronger agreement that violence is acceptable in relationships.
Risk Reduction Intentions	8	Participants who ever had sex	Assesses how empowered adolescents feel about the ability to perform risk reduction behaviors (e.g., “refusing to have sex with my current partner if I don’t want to”). Response options include: “I feel I am NOT strong enough to do this” (0) and “I feel I AM strong enough to do this (1).” A total risk reduction intentions score is calculated by summing responses with higher scores an indication of feeling more empowered.
Readiness to Change	5	Participants who ever had sex	Assesses how strongly adolescents agree with statements such as “I am starting to think about the HIV risk from my behavior.” Response options are on a Likert-type scale from 0 (strongly disagree) to 3 (strongly agree). An average score is calculated with higher scores indicative of greater readiness to change.
Sexual Behavior Practices	12	Participants who ever had sex	12-item section of the WAF that we summed to create a total score. Items ask participants to identify the number of sexual encounters and partners (lifetime and past 2 months), number of times they had coerced or forced sex, frequency of condom use and other prophylaxis, the number of sexual encounters following drug use, and the number of times the adolescent had sex in exchange for drugs, money, or a place to stay. A higher score represents greater risky sexual behaviors. Adolescents who never had sex are assigned a score of 0.
Based on your own behavior, how high is your own risk of getting HIV?	1	All	Response options range from 0 (no risk) to 4 (a great deal of risk). For this study, response categories were collapsed into a binary variable such that an original response of 2, 3, or 4 was categorized as 1 and a response of 0 or 1 was categorized as 0.
Do you suspect or think you may have HIV?	1	All	Yes (1)/No (0)
How concerned are you about getting HIV?	1	All	Response options range from 0 (not at all) to 3 (very much). For this study, response categories were collapsed into a binary variable such that an original response of 1, 2, or 3 was coded as 1 and a response of 0 was coded as 0.
I am fearful of talking about condom use	1	Participants who ever had sex	Response options range from 0 (not at all) to 2 (very much). For this study, response categories were collapsed into a binary variable such that an original response of 1 or 2 was categorized as 1 and a response of 0 was coded as 0.
Have you ever had sex?	1	All	Yes (1)/No (0)
Have you ever had an STI?	1	Participants who ever had sex	Yes (1)/No (0)
Have you ever been tested for HIV?	1	All	Yes (1)/No (0)
Has your partner ever been tested for HIV?	1	Participants who ever had sex	Yes (1)/No (0)
Have you ever been taught about safe sex?	1	All	Yes (1)/No (0)