of these race/ethnic groups are more likely to initially achieve AR but no more likely to sustain it. Alternatively, the lack of association in the earlier study may have reflected its slightly different grouping of race/ethnic groups. In the current study, bivariate associations determined the decision to combine Native Americans with non-Hispanic whites to form the reference group against which all others combined were evaluated. In sum, differences between the current study and our earlier cross-sectional study of recovery reflect numerous differences in sample definition, observation period and measurement and indicate the importance of considering these aspects of study design in the interpretation of findings.
