[Mental maturity, physical development and health status of schoolchildren starting education in urban schools and collective rural community centers].
D002648:Child; D002657:Child Development; D004493:Education; D005260:Female; D006128:Growth; D006262:Health; D006304:Health Status; D006801:Humans; D008297:Male; D011044:Poland; D012424:Rural Population; D014505:Urban Population
Dojrzałość szkolna, rozwój fizyczny i stan zdrowia uczniów rozpoczynajacych nauke w szkołach miejskich i zbiorczych szkołach gminnych.