Table 2.
Basic description of selected studies.
| Category | Author (Year) | Levels of Evidence | n |
|---|---|---|---|
| Comprehensive work programs | Magura et al. (2004) [32] | A level I systematic review | - |
| Butler et al. (2004) [33] | A level I RCT pre-posttest | 194 | |
| Kemp et al. (2004) [34] | A level III one-group study | 245 | |
| Employment counseling and education programs | Lidz et al. (2004) [35] | A level I RCT | 301 |
| Kidorf et al. (2004) [36] | A level III group intervention | 254 | |
| Supported employment plus skills training | Staines et al. (2004) [37] | A level I RCT study | 121 |
| Davis et al. (2012) [28] | A level I RCT study | 75 | |
| Kerrigan et al. (2004) [38] | A level III one-group study | 80 | |
| Incorporated substance use treatment | Coviello et al. (2004) [39] | A level I RCT for a two-group study | 109 |
| McLellan et al. (2003) [40] | A level III study | 529 | |
| Kim (2013) [11] | A level III one-group study | 313 |