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Table 1 CILS4EU - Sweden waves 1–2: Questions, response alternatives and variable definitions

From: Leisure time physical activity and depressive symptoms among adolescents in Sweden

QuestionsResponse alternatives (scales)Variable definitionsWaves
Outcome variable
 Depressive symptoms in grade nine
  How often are each of these statements true about you?
  I feel depressed.Often true, sometimes true, rarely true, never trueOften (often true), non-often (sometimes true, rarely true, never true)2
Main explanatory variable
 Physical activity (PA)
  How often do you do sports or go to the gym?Every day, once or several times a week, once or several times a month, less often, neverEvery day, once or several times a week, once or several times a month, physically inactive (less often or never)2
Control variables
 Smoking
  How often do you smoke cigarettes?Every day, once or several times a week, once or several times a month, less often, neverAt least once a month, less often, never2
 Future education plan
  What are you planning to do after this school year (after the summer holidays)?Upper secondary school, academic track; upper secondary school, vocational track; upper secondary school, provisional track; I will not study but intend to work instead; something elseAcademic track, vocational track, something else2
 Parents' education
  Did your father/mother complete primary school? Did your father/mother complete secondary school? Did your father/mother complete university?Yes, no, don't knowBoth tertiary educated, one tertiary educated, neither tertiary educated2
 Family structure
  Do you live with both your biological parents in one home? Do you also live in another home on a regular basis? Who lives in this second home? How much of the time do you usually live in this second home?Yes, no; Yes, no; Biological mother, biological father, …; More than half the time, about half the time, less than half the time, almost neverTwo-parent household, one-parent household, equally shared custody, unequally shared custody1
 Gender
  Are you a boy or a girl?Boy, girlBoy, girl2
 Depressive symptoms in grade eight
  How often are each of these statements true about you?
   I feel depressed.Often true, sometimes true, rarely true, never trueOften (often true), not often (sometimes true, rarely true, never true)1