Table 1 Summary risk of bias of studies (ROBs-2)
S no. | Author (year) | Bias due to deviations from intended interventions | Bias from missing outcome data | Bias in the measurement of the outcome | Bias in selection of the reported results | The overall risk of bias | ||
|---|---|---|---|---|---|---|---|---|
01 | Daniel (1993) | Some concern | Lower risk | Lower risk | Lower risk | Some concerns | ||
02 | Schaad (1993) | Some concern | Lower risk | Lower risk | Lower risk | Some concerns | ||
03 | Principi (1995) | Some concern | Lower risk | Lower risk | Lower risk | Some concerns | ||
04 | Arguedasa et al (1996) | Lower risk | Lower risk | Lower risk | Lower risk | Low risk | ||
05 | Gerson (1996) | Some concern | Lower risk | Lower risk | Lower risk | Some concerns | ||
06 | Mohini (1996) | Some concern | Lower risk | Lower risk | Lower risk | Some concerns | ||
07 | Samuel (1996) | Lower risk | Lower risk | Lower risk | Lower risk | Low risk | ||
08 | Dagan (2000) | Lower risk | Lower risk | Lower risk | Lower risk | Low risk | ||
09 | Arrieta et al. (2003) | Lower risk | Lower risk | Lower risk | Lower risk | Low risk | ||
10 | Block et al. (2003) | Lower risk | Lower risk | Lower risk | Lower risk | Low risk | ||
11 | Dune et al. (2003) | Lower risk | Lower risk | Lower risk | Lower risk | Low risk | ||
12 | Hoberman et al. (2005) | Lower risk | Lower risk | Lower risk | Lower risk | Low risk | ||
13 | Guven et al. (2006) | Some concern | Lower risk | Lower risk | Lower risk | Some concerns | ||
14 | Arguedas et al. (2011) | Lower risk | Lower risk | Lower risk | Lower risk | Low risk | ||