title: The secular trend in the age of menarche in Australian schoolgirls.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001315:Australia; D002648:Child; D005260:Female; D006801:Humans; D008572:Menarche; D008598:Menstruation; D011627:Puberty; D012959:Socioeconomic Factors