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BMJ 2010; 341 doi: https://doi.org/10.1136/bmj.c4288 (Published 10 August 2010) Cite this as: BMJ 2010;341:c4288

US girls are maturing earlier: A study of 1239 girls found that 10% of non-Hispanic white girls, 15% of Hispanic girls, and 23% of black girls had begun puberty at age 7, as measured by breast tissue development. At age 8, 18% of non-Hispanic white girls, 31% of Hispanic girls, and 43% of black girls had begun puberty. The percentages among non-Hispanic white girls were significantly higher than in a 1997 study (Pediatrics doi:10.1542/peds.2009-3079).

Fewer drivers are found to be over the blood alcohol limit: …

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