Table 2.
Descriptive Information for Each Study Regarding Therapists.
| Study | k | m | Type of Therapists | Therapist Training |
Therapist Supervised |
|---|---|---|---|---|---|
| Efficacy Studies | |||||
| 1. Abramowitz et al. (2003) | 5 | 2.87 | FTC and CR | Yes | Yes |
| 2. Carlbring et al. (2006) | 3 | 7.43 | CR and NC/CT | Yes | Yes |
| 3. Carroll et al. (2004) | 5.25 | 3.86 | FTC and CR | Yes | Yes |
| 4. Christensen et al. (2004) | 7 | 8.39 | FTC | Yes | Yes |
| 5. Ehlers et al. (2003) | 3 | 8.31 | FTC | Yes | Yes |
| 6. Kim et al. (2006) | 17 | 5 | FTC | Yes | Yes |
| 7. Koch et al. (2004) | 4 | 3.62 | NC/CT | Yes | Yes |
| 8. Lange et al. (2003) | 18 | 2.92 | NC/CT | Yes | Yes |
| 9. Szapocznik et al. (2004) | 3 | 18.40 | CR and NC/CT | Yes | Yes |
| 10. Taylor et al. (2003) | 2 | 7.75 | CR | Yes | Yes |
| 11. The Marijuana Treatment Project Research Group (2004) | 12 | 7.04 | FTC | Yes | Yes |
| 12. van Minnen et al. (2003) | 5 | 2.51 | NC/CT | Yes | Yes |
| 13. Watson et al. (2003) | 7.5 | 4.25 | CR and NC/CT | Yes | Yes |
| Effectiveness Studies | |||||
| 14. Baldwin et al. (2007) | 80 | 4.1 | FTC and NC/CT | No | Noa |
| 15. Diner et al. (2008) | 50 | 51.1 | FTC and NC/CT | No | Noa |
| 16. Kuyken (2004) | 20 | 3.32 | FTC | Yes | Yes |
| 17. Lincoln et al. (2003) | 9.5 | 2.92 | NC/CT | Yes | Yes |
| 18. Merrill et al. (2003) | 8 | 17.19 | FTC | Yes | Yes |
| 19. Trepka et al. (2004) | 6 | 4.18 | FTC | Yes | Yes |
| 20. Wampold & Brown (2005) | 581 | 9.68 | FTC | No | No |
Note. k = Study-level mean number of therapists contributing to any given intraclass correlation; m = Study-level mean number of patients per therapist contributing to any given intraclass correlation; CR = Clinical Researchers; FTC = Full Time Clinicians; NC/CT = Non-Clinicians/Clinicians in Training; a = Although there was supervision for the therapists in training, the supervision was not explicitly a part of the study.