Table 2.
Baseline Differences on Clinically Relevant Variables Prior to and After Propensity Score Matching
| Prior to Propensity Score Matching | After Propensity Score Matching | |||||
|---|---|---|---|---|---|---|
|
Adolescents (n = 1922) |
EA (n = 152) |
Total (n = 2074)a |
Adolescents (n = 151) |
EA (n = 152) |
Total (n = 303) |
|
| (% (n) or M (SD)) | (% (n) or M (SD)) | (% (n) or M (SD)) | (% (n) or M (SD)) | (% (n) or M (SD)) | (% (n) or M (SD)) | |
| Clinical Severity and Treatment Motivation | ||||||
| Number of Substance Use Disorders | .78 (.86) | .93 (.96)** | .78 (.87) | .83 (.94) | .93 (.96) | .88 (.95) |
| Years of Substance Use | 2.9 (2.1) | 4.6 (2.8)** | 3.1 (2.2) | 4.0 (2.8) | 4.7 (2.8)** | 4.3 (2.8) |
| Problem Orientation Scale | .67(1.5) | .99 (1.7)** | .69 (1.5) | .79 (1.6) | .99 (1.7) | .89 (1.6) |
| Conduct Disorder Scale (CDS) | 3.4 (3.2) | 2.8 (2.9)** | 3.4 (3.1) | 2.8 (2.9) | 2.8 (2.9) | 2.8 (2.9) |
| Crime and Violence Scale (CVS) | 7.3 (5.8) | 6.4 (5.4)** | 7.3 (5.7) | 6.3 (5.2) | 6.4 (5.4) | 6.3 (5.3) |
| Anxiety and Fear Severity Scale (AFSS) | 2.2 (2.5) | 2.7 (3.2)** | 2.2 (2.6) | 2.4 (2.8) | 2.7 (3.2) | 2.6 (3.0) |
| Depression Symptom Scale (DSS) | 2.8 (2.6) | 3.3 (2.9)* | 2.8 (2.6) | 3.0 (2.8) | 3.2 (2.9) | 3.1 (2.9) |
| Traumatic Stress Scale (TSS) | 2.2 (3.4) | 2.8 (3.7)** | 2.2 (3.5) | 2.4 (3.7) | 2.8 (3.7) | 2.6 (3.7) |
| General Victimization Scale (GVS) | 3.1(3.1) | 3.7 (3.5)** | 3.1 (3.1) | 3.4 (3.2) | 3.7 (3.5) | 3.5 (3.3) |
| Treatment Process | ||||||
| %Young Adults at Treatment Site | 7.1 (7.6) | 16.9 (9.1)** | 7.8 (8.1) | 14.7 (9.9) | 16.9 (9.1)** | 15.8 (9.6) |
| Length of Treatment (in days) | 180.4 (99.8) | 162.8 (77.7)** | 179.1 (98.4) | 164.4 (86.8) | 162.8 (77.7) | 163.6 (82.2) |
| Environmental Factors | ||||||
| Days in Controlled Environment | 6.5 (16.9) | 4.2 (14.2)** | 6.4 (16.7) | 4.7 (13.7) | 4.2 (14.2) | 4.4 (13.9) |
| Living Risk Index | 10.7 (2.9) | 11.3 (3.5)* | 10.8 (3.0) | 11.0 (3.1) | 11.3 (3.5) | 11.2 (3.3) |
| Baseline Values of Outcomes | ||||||
| Abstinent and in the Community | 24.9% (477) | 19.7% (30) | 24.5% (507) | 23.2% (35) | 19.7% (30) | 21.4% (65) |
| Substance Problem Scale | 2.9 (3.6) | 3.2 (4.2) | 3.1 (3.9) | 3.2 (3.7) | 3.2 (4.2) | 3.2 (3.9) |
| Substance Frequency Scale | .13 (.14) | .17 (.17)** | .13 (.14) | .15 (.15) | .17 (.17) | .16 (.16) |
| Days of alcohol use | 6.0 (11.6) | 9.3 (16.2)** | 6.3 (12.1) | 7.8 (13.9) | 9.3 (16.1) | 8.6 (15.1) |
| Days of binge alcohol use | 3.2 (8.2) | 5.6 (12.2)** | 3.4 (8.6) | 4.5 (11.1) | 5.5 (12.1) | 5.0 (11.6) |
| Days of AODA-free activities* | 10.8 (19.6) | 8.1 (15.1)** | 10.6 (19.3) | 8.8 (17.4) | 8.1 (15.1) | 8.4 (16.2) |
| Days of AODA-involved activities | 9.2 (17.8) | 11.0 (19.0)** | 9.4 (17.9) | 10.5 (20.2) | 11.0 (19.0) | 10.6 (19.5) |
| Social Risk Index | 13.3 (4.3) | 13.9 (4.4) | 13.6 (4.4) | 13.4 (4.2) | 13.9 (4.4) | 13.7 (4.3) |
| Emotional Problem Scale | .25 (.19) | .25 (.19) | .25 (.19) | .24 (.20) | .25 (.19) | .25 (.19) |
*
p<.10,
**
p<.05,
a
Actual n differs by variable due to missing data. On average, 1.5% of responses were missing (range = 0 to 4.9% missing)