What question did this study set out to answer?

To determine the prevalence and mean ages of onset of pubertal characteristics in young girls in U.S. pediatric practices.

April 1, 1997PEDIATRICS

Secondary Sexual Characteristics and Menses in Young Girls Seen in Office Practice: A Study from the Pediatric Research in Office Settings Network

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Cross-sectional study observes earlier onset of pubertal characteristics in young girls, indicating potential need for revised referral criteria.

To determine the prevalence and mean ages of onset of pubertal characteristics in young girls in U.S. pediatric practices.
Cross-sectional study conducted by 225 clinicians in pediatric practices
Standardized training in assessment of pubertal maturation
Data analyzed for 17,077 girls aged 3 to 12 years undergoing physical examinations.
3% of African-American and 1% of white girls show breast/puberty hair development at age 3; 27.2% and 6.7% at age 7, respectively.
Mean onset age for breast development is 8.87 years for African-American girls and 9.96 years for white girls.
Menses occurs at 12.16 years for African-American girls and 12.88 years for white girls.

Herman‐Giddens et al. (1997) studied this question.

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Cross-sectional study observes earlier onset of pubertal characteristics in young girls, indicating potential need for revised referral criteria.