Table 2.

Multivariate associations between non-drinking as the dependent variable and different types of internet activities

	Year 2008	Year 2010	Year 2012
	OR (CI)	OR (CI)	OR (CI)
Model 1
Gender (boys as reference)	0.85 (0.70–1.03)	0.68 (0.66–0.83)	0.70 (0.56–0.88)
Total computer hours	0.91 (0.83–0.99)	0.93 (0.84–1.03)	1.02 (0.90–1.15)
Model 2 (hours/day)
Gender (boys as reference)	1.17 (0.92–1.49)	0.88 (0.69–1.13)	0.91 (0.68–1.23)
Social media/chatting	0.83 (0.79–0.86)	0.82 (0.77–0.86)	0.83 (0.77–0.88)
Computer games	1.03 (0.99–1.07)	1.00 (0.96–1.05)	1.05 (1.00–1.10)
Model 3 (hours/day)
Gender (boys as reference)	1.19 (0.93–1.51)	0.91 (0.70–1.17)	0.96 (0.71–1.29)
Social media/chatting	0.83 (0.79–0.86)	0.81 (0.77–0.86)	0.82 (0.76–0.88)
Computer games weekdays	0.94 (0.80–1.10)	0.87 (0.77–1.00)	0.96 (0.84–1.11)
Computer games weekends	1.13 (0.98–1.30)	1.13 (1.00–1.28)	1.15 (1.00–1.32)

Note. Model 1 includes total computer time, Model 2 includes social media/chatting and computer games, and Model 3 includes computer games divided into weekdays and weekends. The models are adjusted for covariates including country of birth, family substance problems, conflicts between parents, physical abuse, number of friends, status among friends, psychosomatic problems, sleeping problems, use of cannabis and use of other drugs.