Table 2. Substance Use Characteristics Amongst SUD Patients.

SD: Standard Deviation; %: Percent of group; N: number of subjects; n/a: not applicable. “Days of use in 28 days prior to treatment” and “Years of lifetime substance use” measures are only presented for patients who reported any recent or lifetime use of the substance indicated, respectively. Heroin use was assessed separately from other opioids in all cases except for “Current substance use disorders” where the heroin category refers to a broader class of opioids.

Substance Use Characteristics	Cocaine	Alcohol	Marijuana	Heroin	Primary Drug
Primary drug of use/abuse: %, N	75.0, 9	16.7, 2	8.3, 1	0.0, 0	n/a
Current Substance Use Disorders: %, N	75.0, 9	25.0, 3	16.7, 2	16.7, 2	100.0, 12
Days used in 28 days prior to treatment: Mean (SD), N	10.8 (10.9), 9	8.9 (9,1), 7	19.3 (15.0), 3	1.7 (1.2), 3	11.7 (10.8), 12
Years of Lifetime Substance Use: Mean (SD), N	12.8 (7.7), 10	12.9 (9.8), 12	9.5 (6.5), 11	12.2 (11.7), 6	14.2 (7.2), 12