[Investigation of physiological variations of vital capacity in middle and primary school students].
D000293:Adolescent; D000367:Age Factors; D002648:Child; D002657:Child Development / Q000502:physiology*; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D012016:Reference Values; D012737:Sex Factors; D014797:Vital Capacity