Table 2.

Differences between inpatients and outpatients regarding alcohol consumption, psychological distress and frequency of use of the primary drug.

	Outpatients N = 1469	Inpatients N = 164	Significance
AUDIT-CR	4.67 (2.56)	5.60 (2.77)	t (1367) = −4.11; p < 0.001
Psychological distress (lifetime)	3.81 (2.87)	6.29 (2.46)	t (1519) = −10.42; p < 0.001
Psychological distress (last 30 days)	2.30 (2.12)	4.84 (2.31)	t (1515) = −14.12; p < 0.001
Primary drug use, last 30 days (%)  No use  Occasional use  1 day/w or less  2–3 times/w  4–6 times/w  Daily	52.6 19.1 8.2 9.3 4.6 6.0	6.8 6.8 7.4 17.9 16.0 45.1	Chi-square (5) = 342.77; p < 0.001
Primary drug use, last three months (%)  No use  Occasional use  1 day/w or less  2–3 times/w  4–6 times/w  Daily	15.5 30.2 13.6 17.7 8.8 14.2	4.3 6.2 5.6 18.5 16.7 48.8	Chi-square (5) = 158.17; p < 0.001
Usual route of administration (%)  Oral  Nasal  Smoking  Injecting	21.3 1.6 76.9 0.2	17.8 11.0 69.9 1.2	Chi-square (3) = 56.85; p < 0.001