Table 3.

Means of subjects with 0, 1, and ≥2 traffic incidents during first 4 years of licensure, by gender and survey measure

	No. of incidents Mean or %
	0		1		≥2
Survey measure	Women	Men	Women	Men	Women	Men
No. of serious offenses	(n = 1,423)	(n = 1,137)	(n = 283)	(n = 448)	(n = 58)	(n = 258)
No. drinks/week	2.24	3.70	3.48	5.35	4.61	7.04
Alcohol misuse index	2.24	2.69	3.12	3.18	3.26	4.12
Smoke cigarettes	45%	38%	53%	43%	56%	54%
Smoke marijuana	28%	29%	35%	38%	44%	42%
Peer alcohol involvement index	4.96	5.04	5.43	5.39	5.77	5.73
Parents indifferent/approve teen alcohol use	12%	12%	10%	15%	21%	13%
Easy access to alcohol	89%	91%	93%	93%	93%	93%
No. of crashes	(n = 1,051)	(n = 905)	(n = 516)	(n = 602)	(n = 197)	(n = 336)
No. drinks/week	2.21	3.75	2.56	5.52	4.01	5.01
Alcohol misuse index	2.20	2.85	2.53	3.17	3.24	3.10
Smoke cigarettes	44%	36%	47%	44%	58%	50%
Smoke marijuana	27%	30%	31%	35%	39%	37%
Peer alcohol involvement index	4.91	5.17	5.21	5.39	5.47	5.11
Parents indifferent/approve teen alcohol use	11%	13%	13%	12%	12%	11%
Easy access to alcohol	89%	91%	90%	93%	95%	92%
No. single-vehicle crashes	(n = 1,677)	(n = 1,686)	(n = 85)	(n = 146)	(n = 2)	(n = 11)
No. drinks/week	2.51	4.50	2.33	5.33	13.60	3.12
Alcohol misuse index	2.40	3.00	2.73	2.99	4.24	3.36
Smoke cigarettes	46%	40%	55%	54%	100%	45%
Smoke marijuana	30%	32%	24%	43%	100%	45%
Peer alcohol involvement index	5.07	5.21	4.92	5.37	9.00	5.44
Parents indifferent/approve teen alcohol use	12%	12%	15%	12%	100%	10%
Easy access to alcohol	90%	92%	87%	93%	100%	100%