1. On an average day…
a. How many calls do you make with your mobile phone?
0–5	6–10	11–15	16–20	More than 20
b. How many text messages do you send with your mobile phone?
0–5	6–10	11–15	16–20	More than 20
2. Do you usually turn off your mobile phone at night?
Yes	No
3. How often do you use your mobile phone communicate with people while in bed?
Never	Rarely	Sometimes	Often	Almost every day/night
4. How often do you use your mobile phone to play free online games, bet on sports or other gambling?
Never	Rarely	Sometimes	Often	Almost every day/night
5. How many people do you communicate with through social media, chat functions, WhatsApp, Skype or other on an average day?
0	1–10	11–50	51–100	More than 100
6. How many hours per day do you usually use social media, chat functions, WhatsApp, Skype or other?
Less than 1 h	1–2 h	2–3 h	3–4 h	More than 4 h
7. How long does it usually take for you to answer through social media in the following situations?
	I answer immediately	I wait a little, but try to answer as fast as possible	I wait as long as I need until I answer	I never answer in this situation
While relaxing at home
While at work or in school
While with friends
While in bed
While eating lunch