Van der Elst et al10 | Clearly stated | Not clearly stated | Examiner was masked to intervention status | Exact percentage follow up at 8 months not stated |
Goldberg et al11 | Clearly stated | Not clearly stated | Examiners were masked to intervention status | There was complete follow up in the treated; 60% untreated |
Black et al12 | Clearly stated | Drawing a card from deck generated by a random number table | Unclear | Two year follow up of 62%. Some data provided on failure of follow up. 7 year follow up of 49/93. |
Bada et al13 | Clearly stated | Not clearly stated | Examiners were masked to intervention status | Follow up was 67% |
Ratrisawadi et al14 | Clearly stated | Alternate assignment | Unclear | Follow up was 38% |