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Table 2 Definition of the variables Substance use and Problematic social networking site usage (PSNSU)

From: Problematic social networking site usage and substance use by young adolescents

Variable Question
Substance use Have you drunk an alcoholic beverage at least once in the last month? (Yes/No)
Have you drunk an energy drink at least once in the last month? (Yes/No)
Have you smoked at least once in the last month? (Yes/No)
PSNSU Do you ever stay up late and get up early in order to spend more time on social networking sites (Facebook, Netlog, Twitter, ...)?
Never/Rarely/Sometimes/Often/Always)
Do you feel anxious if you cannot connect to the social network for a while? (Never/Rarely/Sometimes/Often/Always)
Have you ever spent more time on social networking sites than you had intended? (Never/Rarely/Sometimes/Often/Always)
Have you ever neglected homework, sports activities, time with friends, and so on, in order to spend more time on social networks? (Never/Rarely/Sometimes/Often/Always)
How often do you try to cut down the amount of time you spend on social networks and fail? (Never/Rarely/Sometimes/Often/Always)
Have you ever thought, ‘I’ll carry on just for a few more minutes’ when on social networks? (Never/Rarely/Sometimes/Often/Always)