. Author manuscript; available in PMC: 2014 Aug 19.

Published in final edited form as: J Pediatr Endocrinol Metab. 2014 Jan;27(0):47–51. doi: 10.1515/jpem-2013-0286

Table 2.

Age at thelarche and menarche by race/ethnicity.

	Total n (n pre-, n post-thelarche or menarche)	3rd percentile mean±SE	50th percentile mean±SE	97th percentile mean±SE
Age at thelarche, year
NHC	425(118, 307)	7.34±0.25	9.75±0.13	12.16±0.36
African-Americans	83(14, 69)	7.44±0.48	9.36±0.33	11.27±0.85
Hispanics	44(10, 34)	8.13±0.52	9.60±0.27	11.06±0.69
All^a	608(159, 449)	7.43±0.20	9.70±0.11	11.97±0.29
Age at menarche, year
NHC	427(295, 132)	10.66±0.12	12.77±0.09	14.88±0.17
African-Americans	83(43, 40)	10.17±0.23	12.17±0.16	14.17±0.29
Hispanics	44(31, 13)	10.57±0.34	12.47±0.25	14.38±0.51
All^b

Total of 610 females includes non-Hispanic Caucasians, African-Americans, Hispanics, as well as those self-identified as “other”.

Results not provided for all subjects combined because of statistically significant mean differences among groups. SE, standard error; NHC, non-Hispanic Caucasian.