Table 1.

Baseline socio-demographic, substance use, mental health and readiness to change characteristics of the total (N = 335) sample and those who completed the 3 month follow-up (N = 182)

	Total Sample	Follow-up sample
	N = 335	N = 182
Gender (%, n)
Male	65.5 % (218)	62.1 % (113)
Female	34.5 % (115)	37.9 % (69)
Age (mean, SD)	30.3 (9.6)	30.1 (9.3)
Race (%, n)
Black	58.9 % (195)	52.0 % (93)
Coloured	40.3 % (135)	48.0 % (86)
Marital Status (%, n)
Single	82.9 % (272)	84.7 % (150)
Married/attached	17.1 % (56)	15.3 % (27)
Education (%, n)
Did not finish high school	50.1 % (168)	51.1 % (93)
Finished high school	49.9 % (167)	48.9 % (89)
Employment (%, n)
Employed	44.6 % (148)	47.5 % (86)
Unemployed	55.4 % (184)	52.5 % (95)
Substance Use Involvement Scorea (mean, SD)	19.3 (6.2)	19.6 (6.5)
Problem Alcohol use (%, n)
Yes (%, n)	86.6 % (290)	86.3 % (157)
No (%, n)	13.4 % (45)	13.7 % (25)
Problem Cannabis use (%, n)
Yes (%, n)	14.6 % (49)	12.6 % (23)
No (%, n)	85.4 % (286)	87.4 % (159)
Problem methamphetamine use (%, n)
Yes (%, n)	8.1 % (27)	11.0 % (20)
No (%, n)	91.9 % (308)	89.0 % (162)
Alcohol use only
Yes (%, n)	78.2 % (262)	77.5 (141)
No (%, n)	21.8 % (73)	22.5 % (41)
Drug use only
Yes (%, n)	9.0 % (30)	9.3 % (17)
No (%, n)	91.0 % (305)	90.7 % (165)
Poly-substance use
Yes (%, n)	12.8 % (43)	13.2 % (24)
No (%, n)	87.2 % (292)	86.8 % (158)
Injury related to substance use
Yes (%, n)	54.2 % (181)	54.1 % (98)
No (%, n)	45.8 % (153)	45.9 % (83)
Depression score (CES-D; mean, SD)	17.6 (10.6)	15.9 (9.9)
SOCRATES Recognition (mean, SD)	19.0 (6.0)	18.7 (6.2)
SOCRATES Ambivalence (mean, SD)	11.2 (3.8)	11.0 (4.0)
SOCRATES Taking Steps (mean, SD)	25.23 (7.2)	25.6 (6.9)

^aFor this variable, the highest scoring substance was used for each participant