Sexual maturation in contemporary American girls.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D004777:Environment; D005260:Female; D006801:Humans; D008572:Menarche; D008598:Menstruation; D009765:Obesity / Q000503:physiopathology; D011627:Puberty; D012727:Sex Characteristics; D012959:Socioeconomic Factors; D014481:United States