[Selected hygienic and health factors as well as their importance as variables bearing on scholastic achievements at the elementary school level].
D002648:Child; D002657:Child Development; D006801:Humans; D007858:Learning; D005082:Physical Exertion; D012572:School Health Services; D012959:Socioeconomic Factors
Wybrane czynniki higieniczno-zdrowotne i ich znachzenie jako zmiennych warunkujacych wyniki pracy szkolnej uczniów szkół podstawowych.