[Questionnaire results on the effect of the academic load on 12-year-old schoolchildren].
D001604:Berlin; D002648:Child; D005260:Female; D006801:Humans; D007899:Leisure Activities; D008297:Male; D005222:Mental Fatigue / Q000503:physiopathology; D009031:Moscow; D011603:Psychophysiology; D013334:Students; D011795:Surveys and Questionnaires; D014505:Urban Population
Rezul'taty oprosa o vliianii nagruzki na dvenadtsatiperstnikh shkol'nikov.