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. 2016 Feb 20;16:35. doi: 10.1186/s12888-016-0742-8

Table 2.

Unadjusted and Adjusted Linear Regression Models Predicting Change in ASSIST scores from baseline to 3 month follow-up (n = 182)

Unadjusted Analysis Adjusted Analysis
Variables B 95 % CI a p-value B 95 % CI p-value
Age 0.03 -0.08-0.14 0.56 0.02 -0.09-0.13 0.77
Gender (Male)
 Female 0.98 -1.13-3.08 0.36 1.54 -0.51-3.60 0.14
Race (black)
 Coloured -0.42 -2.49-1.64 0.69 0.15 -1.96-2.27 0.89
Marital Status (single)
 Married 1.48 -1.38-4.35 0.31
Education (not complete school)
 Completed high school 0.28 -1.77-2.33 0.79
Employment
 Unemployed -1.49 -3.53-0.56 0.15
Problem Alcohol use (no)
 Yes 1.73 -1.24-4.90 0.25 4.40 0.90-7.90 0.01
Problem Cannabis use (no)
 Yes -0.001 -3.08-3.08 0.99 1.11 -1.85-4.06 0.46
Problem Methamphetamine (no)
 Yes 1.34 -1.93-4.60 0.42 3.26 -0.89-7.42 0.12
Poly-substance use (no)
 Yes 0.55 -2.5- 3.57 0.72
Injury related to substance use (no)
 Yes -0.14 -2.20-1.93 0.90
Depression score (CES-D) 0.08 -0.02-0.18 0.13
Readiness to change: Ambivalence (low)
 High 2.18 -0.22-4.57 0.07
Readiness to change: Recognition (low)
 High 4.55 1.87-7.22 0.001 11.60 6.19-16.19 <0.001
Readiness to change Taking Steps (low)
 High 2.38 -0.68-5.44 0.13 -9.51 -15.52--3.50 0.002
Intervention Condition
 MI vs. Others -0.97 -3.07-1.13 0.36 1.82 -0.41-4.05 0.11
 PST vs. Others 4.28 2.01-6.54 <0.001 5.61 3.07-8.15 <0.001

a95 % CI = 95 % confidence interval