“…The following variables were assessed, and included in the analyses as covariates, as they are known to be associated with depression: BMI (weight/length 2 , self-reported) [ 62 , 63 ], sex [ 64 , 65 ], age in years [ 66 ], alcohol consumption (number of days per week that alcohol was consumed times units consumed per consumption moment) [ 67 ], smoking (yes/no, yes if the participant had indicated to smoke more than 0 cigarettes per week) [ 68 ], parental level of education (subdivided into eight levels from primary school to university) [ 69 ], pubertal status according to the categorisation suggested by Petersen et al (subdivided into five levels from prepubertal to postpubertal) [ 70 ] (association between pubertal status and depression [ 71 , 72 ]), and diagnosis which might influence learning (yes/no, e.g. autism, dyslexia, ADHD) [ 73 , 74 ].…”