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Table 1 The operationalization of the studied health behaviors and health indicators (N = 2,690)

From: Clustering of health-related behaviors, health outcomes and demographics in Dutch adolescents: a cross-sectional study

Variable Item Operationalization
Cannabis Use [32] Have you ever used Cannabis (hashish, marihuana or weed)? 0) No, 1) Yes
  Have you recently (in the last 4 weeks) used cannabis (hashish, marihuana or weed) 0) No, 1) Yes
Alcohol use [32] Have you ever drunk alcohol? 0) No, 1) Yes
  Have you recently drunk alcohol? 0) No, 1) Yes
  How many days a week do you drink alcohol? Number a day
  How many glasses, cans or bottles of alcohol do you drink a day? Number a day
Binge drinking [32] How often in the last 4 weeks have you had more than 4 alcoholic beverages on one occasion? Number of times, ranging from “Never” to “9 Times or more”.
Smoking [32] Have you ever smoked a cigarette? 0) No, 1) Yes
  Have you recently smoked a cigarette? 0) No, 1) Yes
  How many cigarettes do you smoke per week? Categories advancing with 10 pieces per category, ranging from ”0-10” to “70 or more”
Nutrition [32] How often do you have breakfast per week? Number of days
  How often do you eat vegetables per week? Number of days
  How often do you eat fruits per week? Number of days
Physical exercise [32] How do you travel to school usually? 0) By bike, 1) Walking, 2) Else
  How long does it take you to walk or bike to school (one-way trip)? Number of mins
  How many hours of gym class do you have at school each week? Categories ranging from “0” to “4”.
  Are you a member at a sports club? 0) No, 1) Yes
  How many hours a week do you spend at your sports club? Number of hours
  How many hours a week do you spend on other sports related activities than previously addressed? Number of hours
Watching TV [32] How many days a week do you watch TV? Number of days
  How many hours a day do you watch TV? 0) Less than 30 mins, 1) 30 mins – 1 hour, 2)1-2 hours, 3) 2–3 hours, 4) >3 hours
Using the internet/PC [32] How many days per week do you use the internet/PC (not for school purposes)? Number of days
  How many hours a day do you use the internet/PC (not for school purposes) 0) Less than 30 mins, 1) 30 mins – 1 hour, 2)1-2 hours, 3) 2–3 hours, 4) >3 hours
Videogame playing [32] How many days a week do you play videogames on a game console? Number of days
  How many hours a day do you play videogames on a game console? 0) Less than 30 mins, 1) 30 mins – 1 hour, 2)1-2 hours, 3) 2–3 hours, 4) >3 hours
Compulsive internet use [22] Compulsive Internet Use Scale (CIUS) E.g. Do you rather spend time on the internet than spending time with others? (total: 14 items) 0) Never, 1) Rarely, 2) Sometimes, 3) Often, 4) Very often
Compulsive videogame playing [21] Videogame Addiction Test (VAT). E.g. Do you rather spend time playing videogames than spending time with others? (total: 14 items) 0) Never, 1) Rarely, 2) Sometimes, 3) Often, 4) Very often
Body Mass Index [32] How tall are you (no shoes)? Number of cm
  What do you weigh? Number of kg
Psychosocial problems [38] Strengths and Difficulties Questionnaire (SDQ) E.g. I am easily distracted, I find it difficult to focus (total: 20 items) 0) Not true, 1) A little true, 2) Very true
General Self-Efficacy [43] General Self-Efficacy (GSE) Survey. E.g. If you are going to do something, are you afraid you will fail? (total: 11 items) 0) Never, 1) Sometimes, 2) Often, 3) Very often