† For site-level (13 sites in specialist and 11 in non-specialist) fixed-effects logistic regression model adjusting for the other variables listed in the tables. There were 1,313 observations in the specialist group and 710 in the non-specialist group. The dummy variable adjustment was used for missings on education, race and ethnicity, employment and marital status. The odds ratios on those variables are not shown here.
* Statistically significant at the 5 percent level.
** Statistically significant at the 1 percent level. OR = Odds Ratio. CI = Confidence Interval.