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J Adolesc Health. 2007 Mar;40(3):227-31. Epub 2007 Jan 24.

Has age at menarche changed? Results from the National Health and Nutrition Examination Survey (NHANES) 1999-2004.

Author information

  • 1National Center for Health Statistics, Division of Health and Nutrition Examination Surveys, Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, Hyattsville, Maryland 20782, USA. mxm7@cdc.gov

Abstract

PURPOSE:

To examine self-reported age at menarche in U.S. adults and the associations between age at menarche and race/ethnicity.

METHODS:

Data from 1999-2004 National Health and Nutrition Examination Survey (NHANES) for 6788 females 20 years and over were analyzed. Self-reported age at first menses (in years) by birth year groups is reported overall and for Mexican Americans, non-Hispanic whites, and non-Hispanic blacks.

RESULTS:

Mean age at menarche in the United States declined over time from 13.3 years (95% CI: 13.2-13.5) in the oldest age group, those born prior to 1920, to 12.4 years (95% C.I. 12.2-12.5 years) in the youngest group, born between 1980 and 1984. Declines in age at menarche were observed for all race/ethnicity groups. Non-Hispanic black females had the largest decline in mean age at menarche from 13.6 years (95% CI: 13.1-14.1) in women born prior to 1920, to 12.2 years (95% CI: 11.8-12.6) in the 1980-84 birth cohort. Mean age at menarche among non-Hispanic white females declined from 13.3 years (13.1-13.6) in the pre-1920 birth cohort to 12.5 years (12.3-12.8) in the 1980-84 birth cohort.

CONCLUSIONS:

Significant declines in the mean age of menarche for U.S. females occurred overall and for all race/ethnic groups examined. Mean age of menarche declined by .9 year overall in women born before 1920 compared to women born in 1980-84; the declines in the mean age at menarche ranged from .7 to 1.4 years depending on the race/ethnicity group.

PMID:
17321422
[PubMed - indexed for MEDLINE]
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