Table 2.
Results of Comparison of Dichotomous Variables (Chi-Square Test)
| Variable | Drug Studies, n/Na (%) | Psychotherapy Studies, n/Na (%) | χ 2 | P |
|---|---|---|---|---|
| Use of operationalized criteria for diagnosis | 76/80 (95) | 42/54 (77.8) | 7.53 | .006 |
| Only inpatients included | 64/74 (86.49) | 10/39 (25.64) | 39.19 | <.0001 |
| Intervention administered in monotherapy | 80/80 (100) | 1/52 (1.89) | 124.79 | <.0001 |
| High risk of bias for blinding of participants and personnel | 0/80 (0)b | 54/54 (100) | 129.88 | <.0001 |
| High risk of bias for blinding of outcome assessment | 0/80 (0)b | 14/54 (25.92) | 20.47 | <.0001 |
| High risk of bias for incomplete outcome data | 5/80 (6.25) | 35/54 (64.81) | 50.05 | <.0001 |
| High risk of bias for selective reporting | 10/80 (12.5) | 19/54 (35.19) | 8.49 | .0035 |
| Public funded | 1/61 (1.6) | 33/40 (82.5) | 67.16 | <.0001 |
| Conflict of interest | 60/78 (76.92) | 35/53 (66.04) | 1.36 | .2418 |
Note: aDenominator is not always equal to the total number of studies because only studies reporting the corresponding information were used for each analysis.
bThe studies in this review were double blinded by inclusion criteria.