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. 2014 Feb 5;9(2):e88233. doi: 10.1371/journal.pone.0088233

Table 1. Independent variable derivation from survey data.

Survey Question Coding Variable
How old are you? 11–16 years (coded categorically) Age
What is your sex? (1) Male Sex
(0) Female
During the past 30 days, how often did (1) Most of the time/always Food insecurity
you go hungry because there was not (0) Never/rarely/sometimes
enough food in your home?
During the past 12 months, how often (1) Most of the time/always Anxiety
have you been so worried about (0) Never/rarely/sometimes
something that you could not sleep at
night?
During the past 12 months, how often (1) Most of the time/always Loneliness
have you felt lonely? (0) Never/rarely/sometimes
How many close friends do you have? (0) 0 close friends Close friends
(1) 1 close friends
(2) 2 close friends
(3) 3+ close friends
During the past 30 days, on how many (0) 0–2 times Truancy
days did you miss classes or school (1) 3 to or more days
without permission?
During the past 30 days, on how many (0) 0 times Bullying
days were you bullied? (1) 1 or more times
During the past 12 months, how many (0) 0 times Attacked
times were you physically attacked? (1) 1 or more times
During the past 12 months, how many (0) 0 times In a fight
times were you in a physical fight? (1) 1 or more times
During the last 30 days, on how many (0) 0 times Smoking
days did you smoke cigarettes? (1) 1 or more times
How old were you when you first used (0) I have never used drugs Illicit drug use
drugs? (1) Any other response
During your life, how many times did (0) 0 times Alcohol misuse
you drink so much alcohol that you (1) 1 or more times
were really drunk?
Parental Support Index
Created by adding the results of the coding below Parental support
During the past 30 days, how often did (1) Most of the time/always Parental homework checking
you parents or guardians check to see (0) Never/rarely/sometimes
if your homework was done?
During the past 30 days, how often did (1) Most of the time/always Parental understanding
your parents or guardians understand (0) Never/rarely/sometimes
your problems and worries?
During the past 30 days, how often did (1) Most of the time/always Parental knowledge of activity
you parents or guardians really know (0) Never/rarely/sometimes
what you were doing with your free
time?
During the past 30 days, how often did (0) Most of the time/always Parental intrusion of privacy
your parents or guardians go through (1) Never/rarely/sometimes
your things without your approval?