3.2. Comparison of the Changes in Parameters between the Two Groups
STILL
The changes before and after the intervention were compared between groups E and C. The results are summarized in Differences in the ratio of male to female dropouts caused differences in the proportion of male-to-female dropouts between the groups (not significant in tests of independence: chi-squared test). Therefore, sex and age were used as covariates, and an analysis of covariance was used to compare changes in driving ability ratings. No significant differences were found for the individual items. Still, as in the unadjusted case, we found significant differences only for the overall judgment of driving ability (