Body mass index as a phenotypic expression of adiposity: quantitative contribution of muscularity in a population-based sample.

Among women, although the difference in self-reported physical activity did not reach statistical significance, African Americans had relatively more subjects in the least active physical activity quartile 1 (29% vs. 22% in Caucasians) and Caucasian women more in quartile 4 (34% vs. 18%), suggesting that the Caucasian women tended to be more physically active.

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