From: Efficacy of depression treatments for immigrant patients: results from a systematic review
Author (year) | Randomization | Allocation masking | Attrition | Missing data handling | Limitations |
---|---|---|---|---|---|
Dwight-Johnson et al. (2011) [54] | Yes: Stratified permuted-block randomization | Participants: No | Intervention: 16% | Intent-to-treat analysis (ITT) employed | No power calculation |
ITT can increase chance of false positive | |||||
 | Researchers: No | Control: 30% | |||
Outcome Assessor: Yes | |||||
Ueberlacker et al. (2011) [62] | Yes: method not described | Participants: No | Intervention: 26% | Not described in detail, but it appears that missing data points have been excluded. | Small sample, risk of attrition bias |
Researchers: No | Control: 42% | ||||
No power calculation | |||||
Outcome Assessor: Yes | |||||
Yeung et al. (2010) [64] | Yes: computer-generated table | Participants: No | Not reported | Not reported | No power calculation |
Researchers: No | |||||
Outcome Assessor: Yes | |||||
Yeung et al. (2012) [63] | Yes: randomized using computer-generated numbers | Participants: No | Intervention: 27% | Used data from week 6 if no data available at week 12. If neither data point available participant was excluded from analysis | Power calculation suggest much larger sample is required |
Researchers: No | Control: 15% | ||||
Outcome Assessor: Yes | |||||
Choi et al. (2012) [53] | Yes: randomization process by independent person | Participants: No | Intervention: 34% | Baseline carried forward | The missing data approach may introduce false positives. No power calculation Small sample |
Researchers: No | Control: 10% | ||||
Outcome Assessor: No | |||||
Beeber et al. (2010) [51] | Yes: block randomization | Participants: No | Intervention: 13% | Power calculation completed and extra participants included to compensate for possible attrition | Small sample |
Researchers: No Outcome Assessor: No | Control: 10% | ||||
Renner et al. (2011) [59] | Yes: method not described | Participants: Not reported | Intervention CBT: 52% | Non-completers excluded | Small sample high risk of attrition bias |
Researchers: Not reported | Intervention SHG: 28% | ||||
Potential risk of selection bias | |||||
Outcome Assessor: Not reported | Control: 45% | ||||
No power calculation |