Table 2 Assessment of risk of bias within and across included studies
Study | Study year | NOS/ STROBE score | GRADE | Allocation concealment (Selection bias) | Blinding | Incomplete outcome data | Random sequence generation | Selective outcome reporting | Other sources of bias |
|---|---|---|---|---|---|---|---|---|---|
Cox H | 2014 | 4/19 | VL | N | Y | Y | N | Y | A |
Brust JC | 2012 | 4/19 | VL | N | Y | N | N | N | A, D |
Vaghela JF | 2015 | 4/19 | VL | N | Y | Y | N | Y | A, D |
Oyieng’o D | 2012 | 4/19 | VL | N | Y | Y | N | N | A, D |
Joseph P | 2011 | 4/19 | VL | N | Y | Y | N | N | A, D |
Van Deun A | 2010 | 5/20 | L | N | Y | Y | N | Y | A, D |
Brust JC | 2010 | 5/20 | L | N | Y | Y | N | Y | A, D |
Singla R | 2009 | 4/19 | VL | N | Y | Y | N | Y | A, D |
Tupasi TE | 2006 | 4/19 | VL | N | Y | Y | N | Y | A, D |
Thomas A | 2007 | 4/19 | VL | N | Y | Y | N | Y | A, D |
Liu CH | 2011 | 5/20 | L | N | Y | Y | N | Y | A, D |
Keshavjee S | 2008 | 5/20 | L | N | Y | Y | N | Y | A, D |
Shin SS | 2007 | 5/19 | L | N | Y | N | N | Y | A, D |
Cox HS | 2007 | 4/19 | VL | N | Y | N | N | N | A,D |
Wei XL | 2015 | 4/19 | VL | N | Y | Y | N | N | A,D |
Hirpa S | 2013 | 5/20 | L | N | Y | N | N | N | A, D |