Table 1

Characteristic distributions (%) for cases and controls

Characteristic	Value	Cases (n=10795)	Controls (n=12906)
*Excluded are 30 drivers with unknown time of crash.
†Excluded are 1019 drivers with unknown or unrecorded alcohol use status.
‡Excluded are five drivers with unknown sex.
Time of crash*	6 am–4 pm	43	50
	4 pm–6 pm	14	17
	6 pm–8 pm	11	13
	8 pm–10 pm	9	10
	10 pm–midnight	10	6
	Midnight–2 am	6	2
	2 am–4 am	4	1
	4 am–6 am	2	0.2

Day of crash	Mon	13	14
	Tue	13	14
	Wed	13	14
	Thu	14	14
	Fri	16	18
	Sat	17	15
	Sun	14	11

Driver alcohol use†	No	90	99.7
	Yes	10	0.3

Sex‡	Male	61	51
	Female	39	49

Age	16	44	38
	17	56	62

Number of passengers	None	48	45
	1	29	32
	2	12	14
	3 or more	11	9