期刊
AMERICAN JOURNAL OF HUMAN BIOLOGY
卷 21, 期 1, 页码 130-132出版社
WILEY-LISS
DOI: 10.1002/ajhb.20836
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资金
- Medical Research Council of South Africa
- Anglo-American Chairman's Fund
- Child, Youth, and Family Development of the Human Sciences Research Council of South Africa
- The University of the Witwatersrand
- Wellcome Trust (UK)
- The South African National Research Foundation
- The Parkes Foundation
- The Child Growth Foundation
- Medical Research Council [G0400161] Funding Source: researchfish
- MRC [G0400161] Funding Source: UKRI
Menarcheal age was estimated for 287 (188 Black; 99 White) urban South African girls born in Soweto-Johannesburg in 1990. The median menarcheal age for Blacks was 12.4 years (95% confidence interval (CI) 12.2, 12.6) and 12.5 years (95% Cl 11.7, 13.3) for Whites. Data from six studies of menarcheal age, including the current study, were analyzed to examine the evidence for a secular trend between 1956 and 2004 in urban South African girls. There was evidence of a statistically significant secular trend for Blacks, but not Whites. Average menarcheal age for Blacks decreased from 14.9 years (95% CI 14.8, 15.0) in 1956 to 12.4 years (95% Cl 12.2, 12.6) in the current study, an average decline of 0.50 years per decade. Fewer data were available for Whites, but average menarcheal age decreased from 13.1 years (95% Cl 13.0, 13.2) in 1977 to 12.5 years (95% CI 11.7, 13.3) in the current study, an average decline of 0.22 years per decade. The diminishing age at menarche and the current lack of difference between Blacks and Whites is probably reflective of the continuing nutritional and socio-economic transition occurring within South Africa. Am. J. Hum. Biol. 21:130-132, 2009. (C) 2008 Wiley-Liss, Inc.
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