Table 1.

Demographics, drinking habits, and driving history

	Group
	Control (n = 20)		DUI (n = 20)
	Mean	95% CI	Mean	95% CI	t	d
Demographic
Age	24.9	23.2–26.6	23.4	22.2–24.6	1.5	0.48
Gender (% male)	65.0		70.0
Education	14.9	15.0–16.8	14.7	14.9–16.5	0.4	0.12
IQ: Verbal	103.4	98.1–108.7	101.3	96.5–108.0	0.6	0.20
IQ: Nonverbal	102.8	97.5–108.1	103.8	97.6–109.9	0.2	0.08
IQ: Composite	103.9	98.7–108.9	103.3	97.8–108.7	0.2	0.06
Alcohol Use
TLFB
Drinking Days	29.4	23.4–35.3	34.2	27.4–41.0	1.1	0.36
Total Drinks	111.7	68.3–155.0	152.2	122.6–181.7	1.6	0.52
Drunk Days	8.1	3.3–12.8	12.3	8.6–15.9	1.5	0.48
Binge Days	7.0	2.9–11.1	10.2	14.3–15.9	1.1	0.37
PDHQ
Quantity	3.5	2.5–4.4	4.4	3.6–5.3	1.6	0.52
Frequency	2.2	1.8–2.6	2.6	1.9–3.3	1.0	0.32
Months	87.6	65.6–109–6	81.2	63.7–98.6	0.5	0.16
SCID-I
Abuse	0.8	0.2–1.3	3.5	3.0–3.9	8.3***	2.69
Dependence	1.1	0.4–1.7	2.8	2.1–3.4	4.0***	1.30
BIS-Total Score	57.4	5–61.6	68.2	62.5–73.9	3.2**	1.03
Driving History
Drive Years	7.8	5.9–9.7	6.6	5.1–8.1	1.1	0.36
Distance	14.8	10.0–19.6	13.8	9.8–17.8	0.3	0.11
Tickets	0.9	0.4–1.4	2.4	1.2–3.5	2.4*	0.78
Collision	0.7	0.3–1.0	1.2	0.6–1.7	1.6	0.51

Note. Age and education are reported in years.

TLFB = Timeline follow-back for past 90 day drinking. PDHQ = Personal Drinking Habits Questionnaire. Quantity = typical number of drinks consumed per session. Frequency = typical number of drinking sessions per week. Months = number of months regularly consuming alcohol. SCID-I = Structured Clinical Interview for the DSM-IV—Alcohol Use Module. BIS Total Score = Total score on the Barratt Impulsivity Scale. Drive months = number of months since first operating a motor vehicle. Distance = number of miles driven daily. Tickets = number of moving violations received. Collisions = number of motor vehicle collisions in which the participant has been involved.

p < .05*, p <.01**, p < .001***