Szukana fraza: [Abstract = "The research included boys and girls aged 7\-9 from primary schools in Wręczyca Wielka Commune in Kłobuck County \(Silesia Province\). The first study was conducted in November in the school year 1999\/2000 and embraced 270 students \(135 girls and 135 boys\)\; the same number of students \- 270 students \(135 girls and 135 boys\) \- was examined in the school year 2012\/2013."]

Wyników: 1