Table 3.

The selected items and response alternatives of HBSC survey questionnaire used in test-retest study

Items	Response Alternatives
Physical Activity
1. Over the past 7 days, on how many days were you physically active for a total of at least 60 minutes per day?	0 day; 1; 2; 3; 4; 5; 6; 7 days.
2. Over a typical or usual week, on how many days are you physically active for a total of at least 60 minutes per day?	0 day; 1; 2; 3; 4; 5; 6; 7 days.
3. OUTSIDE SCHOOL CLASS: How OFTEN do you usually take physical exercise in your free time so that you lose your breath or sweat?	Daily; 4-6 times a week; 2-3 times a week; Once a week; Once a month; Less than once a month; Never.
4. OUTSIDE SCHOOL CLASS: How many HOURS a week do you usually take physical exercise in your free time so that you lose your breath or sweat?	None; Approx. half an hour; Approx. an hour; Approx. 2-3 hours; Approx 4-6 hours; Seven hours or more.
Sedentary Behaviour
How many hours a day do you usually do the following things in your free time?
5. Watch TV or videos or DVDs on school days	None; Approx. half an hour;
6. Watch TV or videos or DVDs at weekends	Approx. an hour; Approx. 2 hours;
7. Use a computer for playing games or use console games on school days	Approx. 3 hours; Approx. 4 hours;
8. Use a computer for playing games or use console games at weekends	Approx. 5 hours; Approx. 6 hours;
9. Use a computer for: chatting online, internet, emailing, homework etc on school days	Approx. 7 hours or more.
10. Use a computer for: chatting online, internet, emailing, homework etc at weekends
11. Spend doing your school homework out of school hours on school days
12. Spend doing your school homework out of school hours at weekends
Sleep
13. When do you usually go to bed if you have to go to school in the next morning?	No later than 21:00; 21:30; 22:00; 22:30; 23:00; 23:30; 24:00; 00:30; 01:00; 01:30; 02:00 or later.
14. When do you usually go to bed at weekends or during holidays?	No later than 21:00; 21:30; 22:00; 22:30; 23:00; 23:30; 24:00; 00:30; 01:00; 01:30; 02:00; 02:30; 03:00; 03:30; 04:00 or later.
15. When do you usually wake up on school mornings?	No later than 05:00; 05:30; 06:00; 06:30; 07:00; 07:30; 08:00 or later.
16. When do you usually wake up at weekends?	No later than 07:00; 07:30; 08:00; 08:30; 09:00; 09:30; 10:00; 10:30; 11:00; 11:30; 12:00; 12:30; 13:00; 13:30; 14:00 or later
Risk Behaviour: substance use
17. Have you ever smoked?	Yes; No.
18. How often do you smoke at present?	Every day; Every week, but not daily; Less than once a week; I do not smoke.
19. How many cigarettes, pipefuls or cigars have you smoked until now?	None; One; Approx. 2-50; More than 50.
At present, how often do you drink...?
20. Beer	Daily; At least once a week; At least once a month;
21. Wine	Rarely; Never.
22. Strong liquors
23. Have you ever had so much alcohol that you have been really drunk?	Never; Yes, once; Yes, 2-3 times; Yes, 4-10 times; Yes, more than 10 times.

HBSC = Health Behaviour in School-aged Children