ethnic groups, subgroups may differ in behavior risk factors, which is worth attending to for the clues it might provide about the reasons for and the consequences of behavioral variation.

None of the group contrasts should be assumed to be static. Socioeconomic change and acculturation modify behavior over time. Trends in behavior risk factors for racial and ethnic groups require continued monitoring. The trends are not all benign, and the reasons for them are certainly not well understood.

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