Table 3:

Model-based comparisons of baseline to post-use changes within each group. Effects are reported as odds ratios (post-use relative baseline) for lane departures, centering, and mean differences (post-use minus baseline) for SDLP, change in speed, change in accelerator pedal position, and change in brake force.

	No-use		Occasional		Daily
	Estimate (p-value)	95% CI	Estimate (p-value)	95% CI	Estimate (p-value)	95% CI
Lane Departures (odds ratio)	0.57 (p = 0.25)	0.22, 1.48	3.71 (p = 0.04)*	1.04, 13.17	1.56 (p = 0.43)	0.52, 4.64
SDLP (cm)	0.11 (p = 0.97)	−5.89, 6.10	4.88 (p = 0.22)	−2.87, 12.63	1.53 (p = 0.63)	−4.73, 7.79
Change in Speed (km/h)	0.82 (p = 0.02)*	0.15, 1.49	−0.27 (p = 0.55)	−1.15, 0.61	−0.29 (p = 0.41)	−0.99, 0.41
Centering (odds ratio)	1.38 (p = 0.29)	0.76, 2.52	1.73 (p = 0.17)	0.80, 3.77	1.05 (p = 0.881)	0.57, 1.94
Change in Accelerator Position	−0.01 (p = 0.47)	−0.04, 0.02	0.06 (p = 0.002)*	0.23, 0.10	0.02 (p = 0.15)	−0.008, 0.05
Change in Brake Force (J)	0.14 (p = 0.32)	−0.14, 0.41	0.01 (p = 0.94)	−0.35, 0.37	−0.21 (p = 0.15)	−0.50, 0.76

^*indicates significant change from baseline to post use within group, p<.05