title: Age of menarche: a changing pattern and its relationship to ethnic origin and delinquency.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D044383:Black People; D005006:Ethnicity; D005260:Female; D006801:Humans; D007604:Juvenile Delinquency; D008572:Menarche; D009519:New York City; D011647:Puerto Rico; D012959:Socioeconomic Factors; D014505:Urban Population; D044465:White People; D001741:Black or African American