Table 2

Comparison of past 3-month reported drug use at study enrolment

Reported past 3-month drug useTotal drug use including marijuana, n=1030Total drug use excluding marijuana, n=494
Any past 3 months drug use% (95% CI)% (95% CI)
 Treatment arm100.0 (100.0 to 100.0)46.9 (42.5 to 51.3)
 Control arm100.0 (100.0 to 100.0)49.0 (44.6 to 53.4)
Mean (95% CI)Mean (95% CI)
Frequency of drug use in the past 3 months
 Treatment arm7.3 (6.7 to 7.9)3.6 (3.0 to 4.2)
 Control arm7.4 (6.9 to 7.9)3.7 (3.3 to 4.1)
Days of drug use in the past 3 months
 Treatment arm50.5 (45.7 to 55.4)18.9 (15.1 to 22.7)
 Control arm50.2 (45.7 to 54.7)18.1 (14.6 to 21.5)
Typical times/day of drug use in the past 3 months
 Treatment arm7.9 (6.7 to 9.2)4.7 (3.6 to 5.8)
 Control arm7.1 (6.0 to 8.1)3.8 (3.0 to 4.6)
Most times/day of drug use in the past 3 months
 Treatment arm11.5 (10.0 to 13.0)6.4 (5.1 to 7.8)
 Control arm11.5 (9.9 to 13.2)6.4 (5.0 to 7.8)
  • Frequency of drug use was reported on a five-point response scale that ranged from no drug use to near-daily/daily drug use (5–7 days/week) in the past 3 months.