Table 1 Questionnaire items and coding scheme
Indicator | Item | Responses (coding scheme) |
|---|---|---|
Outcome Variable (Sexual risk behaviour) | ||
 Ever sex | ‘Have you ever had sexual intercourse?’ | ‘Yes, No’ (coded yes = 1, no = 0) |
 Age of sexual initiation | ‘How old were you when you had sexual intercourse for the first time?’ | ‘I have never had sexual intercourse 11 years old or younger to 18 years old or older’ |
 Number of sex partners | ‘During your life, with how many people have you had sexual intercourse?’ | ‘I have never had sexual intercourse, 1 person to 6 or more people’ |
 Condom use | ‘The last time you had sexual intercourse, did you or your partner use a condom?’ | ‘I have never had sexual intercourse, Yes, No, I do not know’ |
 Birth control use | ‘The last time you had sexual intercourse, did you or your partner use any method of birth control, such as withdrawal, rhythm (safe time), birth control pills, or any other method to prevent pregnancy? | ‘I have never had sexual intercourse, Yes, No, I do not know |
Independent variables | ||
 Substance use | ||
  Current alcohol use | ‘During the past 30 days, on how many days did you have at least one drink containing alcohol?’ | ‘1 = 0 days to 7 = All 30 days (coded 1 = 0, 2–7 = 1)’ |
  Cannabis use | ‘During your life, how many times have you used marijuana | ‘1 = 0 times to 5 = 20 or more times (coded 1 = 0 and 2–5 = 1)’ |
  Amphetamine use | ‘During your life, how many times have you used amphetamines or methamphetamine | ‘1 = 0 times to 5 = 20 or more times (coded 1 = 0 and 2–5 = 1)’ |
 Psychological distress | ||
  No close friends | ‘How many close friends do you have?’ | ‘1 = 0–4 = 3 or more (coded 1 +  = 0, 0 = 1)’ |
  Loneliness | ‘During the past 12 months, how often have you felt lonely?’ | ‘1 = never to 5 = always (coded 1–3 = 0 and 4–5 = 1)’ |
  Anxiety | ‘During the past 12 months, how often have you been so worried about something that you could not sleep at night?’ | ‘1 = never to 5 = always (coded 1–3 = 0 and 4–5 = 1)’ |
  Suicide ideation | ‘During the past 12 months, did you ever seriously consider attempting suicide?’ | ‘Yes, No’ |
  Suicide attempt | ‘During the past 12 months, how many times did you actually attempt suicide?’ | ‘1 = 0 times to 5 = 6 or more times (coded 1 = 0 and 2–5 = 1)’ |
 Protective factors | ||
  School attendance | ‘During the past 30 days, on how many days did you miss classes or school without permission?’ | ‘1 = 0 days to 10 or more days (coded 1 = 1)’ |
  Peer support | ‘During the past 30 days, how often were most of the students in your school kind and helpful?’ | ‘1 = never to 5 = always (coded 1–3 = 0 and 4–5 = 1)’ |
  Parental supervision | ‘During the past 30 days, how often did your parents or guardians check to see if your homework was done?’ | ‘1 = never to 5 = always (coded 1–3 = 0 and 4–5 = 1)’ |
  Parental connectedness | ‘During the past 30 days, how often did your parents or guardians understand your problems and worries?’ | ‘1 = never to 5 = always (coded 1–3 = 0 and 4–5 = 1)’ |
  Parental bonding | ‘During the past 30 days, how often did your parents or guardians really know what you were doing with your free time?’ | ‘1 = never to 5 = always (coded 1–3 = 0 and 4–5 = 1)’ |
  Parental respect for privacy | ‘During the past 30 days, how often did your parents or guardians go through your things without your approval?’ | ‘1 = never to 5 = always (coded 1–3 = 0 and 4–5 = 1)’ |