Table 4:

Estimated effects and p-values for differences between groups. For SDLP, change in speed, accelerator pedal position, and brake force estimated coefficients are reported for the interaction between period (baseline/post-use) and group. For lane departures and centering these coefficients are exponentiated to reflect the multiplicative difference in baseline to post-use odds ratios.

	Occasional vs. No-use (ref)		Daily vs. No-use (ref)		Occasional vs. Daily (ref)
	Estimate	p-value	Estimate	p-value	Estimate	p-value
Lane Departures	6.54	0.02 *	2.57	0.18	2.38	0.31
SDLP (cm)	4.77	0.34	1.43	0.75	3.35	0.51
Change in Speed (km/h)	−1.09	0.052	−1.11	0.02 *	0.02	0.97
Centering	1.25	0.65	0.76	0.53	1.65	0.32
Change in Accelerator Position (%)	0.07	0.004 *	0.034	0.12	0.04	0.13
Change in Brake Force (J)	−0.12	0.23	−0.35	0.09	0.25	0.34

^*indicates significance difference in change from baseline to post use between groups, p<.05