Table 8.

Multiple regression for the interaction between orthogonal contrasts and training gain for the composite score of the on-road performance.

Variable	B	SE	β
Overall driving performance
Linear interaction AB × C	0.022	0.018	0.061
Linear interaction A × B	0.050	0.029	0.082*

A, driving simulator group; B, cognitive training group; C, control group. AB × C, comparison of the average of the training effect for group A and B vs. the training effect for group C.

A × B, comparison of the training effect for group A vs. the training effect for group B.

^*< 0.05.