A study of 17,000 adolescents in the United States found that African-American and Hispanic girls are less physically active than white, non-Hispanic girls—but that those differences are attributable to the schools they attend, not to their ethnic or racial background: African-American, white, and Hispanic girls attending the same school exhibit no difference in physical activity. The findings of the study, led by Tracy Richmond, MD, of the division of adolescent medicine at Children's Hospital Boston, can be found in the June 2006 issue of Pediatrics.