Study location (year) | Random sequence generation (selection bias) | Allocation concealment (selection bias) | Blinding of participants & personnel (performance bias) | Blinding of outcome assessment (detection bias) | Incomplete outcome data (attrition bias) | Selective reporting (reporting bias) | Other | Ref. |
---|---|---|---|---|---|---|---|---|
Gambia (2000) | low | low | low | low | low | low | unclear | [15] |
Gambia (1999) | low | unclear | low | low | low | low | unclear | [16] |
Gambia (1998) | low | unclear | low | low | low | low | unclear | [16] |
Kenya (2003–4) | low | unclear | low | low | low | low | unclear | [17] |
Gambia (2002) | low | low | low | low | low | low | unclear | [18] |
USA* | high | high | low | low | unclear | unclear | unclear | [19] |
USA (1968) | high | high | low | low | unclear | unclear | unclear | [20] |