Variations in the pattern of pubertal changes in boys.
D000293:Adolescent; D000367:Age Factors; D000886:Anthropometry; D001827:Body Height; D002648:Child; D005837:Genitalia, Male / Q000254:growth & development; D006197:Hair / Q000254:growth & development; D006801:Humans; D008297:Male; D011627:Puberty; D013997:Time Factors