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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Alcohol Clin Exp Res. 2010 Jun 1;34(8):1472–1478. doi: 10.1111/j.1530-0277.2010.01232.x

Table 3.

Trends in driving after drinking (DAD), by age and sex

Age 19 Age 20 Age 21 Age 22
n %wt n %wt n %wt n %wt
Females1
 Never 230 62.9 272 57.6 209 46.0 56 50.7
 1-2 times 121 26.4 163 27.7 168 29.4 26 20.9
 3-6 times 33 6.1 49 7.5 74 12.6 24 17.7
 7-9 times 6 1.1 15 2.1 17 2.6 4 1.9
 10 times or more 23 3.5 36 5.1 57 9.4 15 8.8
 Total 413 100.0 535 100.0 525 100.0 125 100.0
Males1
 Never 149 49.4 189 47.5 108 30.1 29 30.1
 1-2 times 100 28.0 144 26.9 138 30.1 41 27.8
 3-6 times 51 13.5 75 13.6 109 20.1 35 25.6
 7-9 times 14 2.4 25 4.1 35 5.7 6 4.3
 10 times or more 37 6.8 54 7.9 84 14.0 24 12.1
 Total 351 100.0 487 100.0 474 100.0 135 100.0
All
 Never 379 56.6 461 52.8 317 38.4 85 39.6
 1-2 times 221 27.2 307 27.3 306 29.8 67 24.6
 3-6 times 84 9.5 124 10.4 183 16.1 59 21.9
 7-9 times 20 1.7 40 3.0 52 4.1 10 3.2
 10 times or more 60 5.0 90 6.5 141 11.6 39 10.6
 Total 764 100.0 1022 100.0 999 100.0 260 100.0

Note: Results are presented as unweighted counts and weighted percentages. Data were restricted to individuals who had access to drive a car in the past year.

1

For both females and males, statistically significant increases in frequency of DAD occurred at ages 20, and 21 (p<.05).