VariableSurvey QuestionResponse Categories
Sociodemographic
 AgeHow old are you?Years
 GenderAre you a girl or a boy?Boy/girl
 Family affluence scale, (Cronbach’s α = 0.44)Does your family own a car, van or truck?No/yes, one/yes, ≥2
Do you have your own bedroom for yourselfNo/yes
During the past 12 mo, how many times did you travel away on holiday with your family?Not at all/once/twice/more than twice
How many computers does your family own?None/1/2/>2
Personal characteristics
School performanceHow would you describe your grades last year?Excellent/good/average/below average
 Television screen timeOn a school day, how many hours a day do you usually spend watching television?None/less than 1 h/1–2 h/3–4 h/>4 h
 Number of movies seenBelow is a list of film titles. Please mark if, and how often, you have seen each film.Never/once/twice/more than twice
 Sensation seeking/rebelliousness (Cronbach’s α = 0.70)How often do you do dangerous things for fun?Not at all/once in a while/sometimes/often/very often
How often do you do exciting things, even if they are dangerous?Not at all/once in a while/sometimes/often/very often
I believe in following rules (recoded).Not at all/a bit/quite well/very well
I get angry when anybody tells me what to do.Not at all/a bit/quite well/very well
Frequency of drinking in close associates
 Peer drinkingHow many of your friends drink alcohol?None/a few/some/most/all
 Mother drinkingHow often does your mother/female guardian drink alcohol? Never/seldom/often but not every day/every day/do not have (coded “never”)
 Father drinkingHow often does your father/male guardian drink alcohol?Never/seldom/often but not every day/every day/do not have (coded “never”)
 Sibling drinkingDo any of your brothers or sisters drink alcohol?Yes/no/do not have (coded “no”)