Table 1.

Means and percentages for survey and driver history measures, by gender and overall (standard deviations in parentheses).

Measure	na	Women Mean (SD) or %	Men Mean (SD) or %	Total Mean (SD) or %
Survey measure
No. drinks/weekb	3,501	2.52 (6.17)	4.56 (9.16)	3.56 (7.90)
Alcohol misuse indexb	3,543	2.42 (3.17)	3.00 (3.95)	2.71 (3.60)
Smoke cigarettes	3,450	46.7%	41.4%	44.3%
Smoke marijuanac	3,431	29.5%	33.2%	31.4%
Peer alcohol involvement index	3,210	5.07 (2.45)	5.23 (2.54)	5.15 (2.50)
Parents indifferent/approve teen alcohol use	3,533	11.9%	12.4%	12.2%
Easy access to alcoholc	3,551	89.6%	92.0%	90.8%
Driver history measures
No. offensesb	3,607	0.92 (1.29)	2.02 (2.34)	1.47 (1.98)
No. serious offensesb	3,607	0.23 (0.53)	0.60 (0.97)	0.42 (0.81)
No. crashesb	3,607	0.54 (0.77)	0.77 (0.95)	0.66 (0.87)
No. SV crashesb	3,607	0.05 (0.23)	0.09 (0.31)	0.07 (0.27)

Notes: SV = single vehicle.

^aSmaller n's reflect missing survey data

^bgender difference significant at α = .01

^cgender difference significant at α = .05.