Fig 1.
Confounding by indication.
Table 1.
Distribution over socio-demographic characteristics from the whole sample (N = 439) and from the subgroup of study participants with operator recorded data (N = 233).
Table 2.
Association between self-reported mobile phone use during night and symptoms.
Fig 2.
Exposure- response frequency of the association between being awakened during night and symptoms (self-reported; adjusted 2).
**adjusted for age, sex, class level, nationality, school level, physical activity, alcohol, education of parents, frequency of mobile phone calls.
Table 3.
Association between operator recorded mobile phone use during night and symptoms 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.
Table 4.
Descriptive statistics for the tests of the cognitive functions.
Fig 3.
Association between self-reported mobile phone use during night and cognitive functions.
t subgroup of the “Being awakened” group. **adjusted for age, sex, class level, nationality, school level, physical activity, alcohol, education of parents, frequency of mobile phone calls.
Table 5.
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.