Table 2b.

Five year crash rates (at-fault collisions), unadjusted and adjusted rate ratios.

	Current Zolpidem Use	MVC (n)	Person-Miles	Crash Ratea	Unadjusted RR (95% CI)	Adjustedb RR (95% CI)
All	Yes	14	4,087,233	3.43	1.41 (0.82 - 2.40)	1.29 (0.75 - 2.21)
	No	294	120,626,847	2.44	Ref	Ref
Female	Yes	8	1,363,443	5.87	1.46 (0.72 - 2.97)	1.40 (0.69 - 2.85)
	No	152	37,816,638	4.02	Ref	Ref
Male	Yes	6	2,723,790	2.20	1.28 (0.57 - 2.91)	1.20 (0.52 – 2.74)
	No	142	82,810,209	1.71	Ref	Ref
Age < 80	Yes	11	3,380,968	3.25	1.41 (0.77 - 2.59)	1.24 (0.67 - 2.29)
	No	211	91,641,996	2.30	Ref	Ref
Age ≥ 80	Yes	3	706,264	4.25	1.48 (0.47 - 4.69)	1.48 (0.47 - 4.71)
	No	83	28,984,851	2.86	Ref	Ref

^aCrash Rates are reported as number of motor vehicle crashes per 1,000,000 person-miles.

^bAdjusted for current number of medications.

RR: Rate Ratio, CI: Confidence Interval, MVC: number of motor vehicle collisions within 5 years prior to baseline.