Association between operator recorded mobile phone use during night and cognitive functions for the sample of 233 study participants for which operator data were obtained, together with the 27 study participants who do not own a mobile phone.

*adjusted for age, sex, class level, nationality, school level, physical activity, alcohol, education of parents.
**adjusted for duration of mobile phone calls in addition to adjusted 1.
1 refers to change in the test score per exposure category.
Association between operator recorded mobile phone use during night and cognitive functions for the sample of 233 study participants for which operator data were obtained, together with the 27 study participants who do not own a mobile phone.