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Percentage reporting drinking and driving, and riding with a drinking driver at each time point
| Variable | Time 1 Past year | Time 2 Past 3 months |
| Nonlicensed | ||
| Rode with a drinking driver, % | 48 | 38 |
| Frequency, mean (SD) | 4.58 (15.52) | 0.87 (1.83) |
| Licensed | ||
| Rode with a drinking driver, % | 63 | 49 |
| Frequency, mean (SD) | 7.84 (22.60) | 1.73 (5.94) |
| Drove after drinking, % | 43 | 36 |
| Frequency | 8.39 (33.10) | 2.11 (4.29) |
