Onset of Breast Development in a Longitudinal Cohort

被引:250
作者
Biro, Frank M. [1 ]
Greenspan, Louise C. [2 ]
Galvez, Maida P. [3 ]
Pinney, Susan M. [5 ]
Teitelbaum, Susan [3 ]
Windham, Gayle C. [6 ]
Deardorff, Julianna [7 ]
Herrick, Robert L. [5 ]
Succop, Paul A. [5 ]
Hiatt, Robert A. [8 ]
Kushi, Lawrence H. [9 ]
Wolff, Mary S. [4 ]
机构
[1] Cincinnati Childrens Hosp Med Ctr, Div Adolescent Med, Cincinnati, OH 45229 USA
[2] Kaiser Permanente, Dept Pediat, San Francisco, CA USA
[3] Mt Sinai Sch Med, Dept Prevent Med, New York, NY USA
[4] Mt Sinai Sch Med, Div Environm Hlth Sci, New York, NY USA
[5] Univ Cincinnati, Dept Environm Hlth, Cincinnati, OH USA
[6] Calif Dept Publ Hlth, Div Environm & Occupat Dis Control, Richmond, CA USA
[7] Univ Calif Berkeley, Sch Publ Hlth, Berkeley, CA 94720 USA
[8] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA
[9] Kaiser Permanente, Div Res, Oakland, CA USA
基金
美国国家卫生研究院;
关键词
puberty; girls; breast development; obesity; BODY-MASS INDEX; CANCER RISK; YOUNG ADULTHOOD; SECULAR TRENDS; WEIGHT STATUS; US CHILDREN; GIRLS; PUBERTY; MENARCHE; AGE;
D O I
10.1542/peds.2012-3773
中图分类号
R72 [儿科学];
学科分类号
100202 ;
摘要
BACKGROUND AND OBJECTIVES: There is growing evidence of pubertal maturation occurring at earlier ages, with many studies based on cross-sectional observations. This study examined age at onset of breast development (thelarche), and the impact of BMI and race/ ethnicity, in the 3 puberty study sites of the Breast Cancer and the Environment Research Program, a prospective cohort of.1200 girls. METHODS: Girls, 6 to 8 years at enrollment, were followed longitudinally at regular intervals from 2004 to 2011 in 3 geographic areas: the San Francisco Bay Area, Greater Cincinnati, and New York City. Sexual maturity assessment using Tanner staging was conducted by using standardized observation and palpation methods by trained and certified staff. Kaplan-Meier analyses were used to describe age at onset of breast maturation by covariates. RESULTS: The age at onset of breast stage 2 varied by race/ethnicity, BMI at baseline, and site. Median age at onset of breast stage 2 was 8.8, 9.3, 9.7, and 9.7 years for African American, Hispanic, white non-Hispanic, and Asian participants, respectively. Girls with greater BMI reached breast stage 2 at younger ages. Age-specific and standardized prevalence of breast maturation was contrasted to observations in 2 large cross-sectional studies conducted 10 to 20 years earlier (Pediatric Research in Office Settings and National Health and Nutrition Examination Survey III) and found to have occurred earlier among white, non-Hispanic, but not African American girls. CONCLUSIONS: We observed the onset of thelarche at younger ages than previously documented, with important differences associated with race/ethnicity and BMI, confirming and extending patterns seen previously. These findings are consistent with temporal changes in BMI.
引用
收藏
页码:1019 / 1027
页数:9
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