Table 4.

Differences between survey years and gender differences in the associations between internet activities and non-drinking measured with interaction effects

	OR (CI)
Effect of survey year
Social media/chatting × survey year	1.00 (0.97–1.03)
Computer games weekdays × survey year	1.03 (0.98–1.09)
Computer games weekend × survey year	1.01 (0.97–1.06)
Gender differences
Social media/chatting × gender (girl)	0.86 (0.78–0.95)
Computer games weekdays × gender (girl)	1.12 (0.95–1.32)
Computer games weekend × gender (girl)	0.96 (0.82–1.11)

Note. The interaction effects of survey year are adjusted for gender and all covariates. The interaction effects of gender are adjusted for survey year and all covariates. Main effects were also included in the models. Adjusted covariates included 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.