Table 2.
The measure of driving after drinking by study
| Study | Original question | Original response | Harmonized response |
|---|---|---|---|
| 2, 4, 8a, 8b, 8c, 9, 10.1, 15, 16, 19, 20 | How many times did the following things happen to you while you were during alcohol or because of your alcohol use during the following time period? Drove shortly after having more than two drinks? (DD1) Drove shortly after having more than four drinks? (DD2) |
0 = 0 times 1 = 1–2 times 2 = 3–5 times 3 = 6–10 times 4 = More than 10 times/11 or more times (Study 2) |
0 = 0. Did not drive after more than two (four) drinks 1–4 = 1. Drove after more than two (four) drinks at least once |
| 3 | During the past 3 months, how many times did you drive within an hour or so after drinking 3 or more beers or other alcoholic drinks? (DD1) | Open-ended (0–10 times) | 0 = 0. Did not drive after three+ drinks in the past 3 months 1+ = 1. Drove after three+ drinks at least once in the past 3 months |
| 7.1 and 7.2 | Indicate how many times you participated in the following activities during the past month Drove after drinking 3–4 alcoholic drinks? (DD1) Drove after drinking 5 or more alcoholic drinks? (DD2) |
Open-ended (0–99 times) | 0 = 0. Did not drive after three+ (five+) drinks in the past month 1+ = Drove after three+ (five+) drinks at least once in the past month |
| 11 | Number of times in the past month user reported driving shortly after having 3+ drinks. (DD1) | Open-ended (0–8 times) | 0 = 0. Did not drive after 3+ drinks in the past months 1+ = Drove after 3+ drinks at least once in the past month |
| 21 | How many times did the following things happen to you while you were drinking or because of your alcohol use during the last 3 months? Drove a vehicle shortly after having three or more drinks? (DD1) | 0 = Never 1 = 1–2 times 2 = 3–5 times 3 = 6–10 times 4 = More than 10 times |
0 = 0. Did not drive after 3+ drinks in the past 3 month 1–4 = 1. Drove after 3+ drinks at least once in the past 3 month |
Notes. The referent time period for DD outcome was 1 month for Studies 7, 11, 15, 16, 19 and 20; 2 months for Study 2; 3 months for Studies 3, 8a, 8b, 8c, 9, 21; and 6 months for Studies 4 and 10.1. BL, baseline; FU, follow-up; DD1, driving after two+/three+ drinks; DD2 = driving after four+/five+ drinks.