Table 2

Methodological quality and risk bias summary

Bashandy et al 16 Cros et al 17 Ali Hassn et al 19 Kamiya et al 20 Neethu et al 18 O’Scanaill et al 21 Versyck et al 22
Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Random sequence generation (selection bias)
Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Allocation concealment (selection bias)
Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Blinding of participants (performance bias)
Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Blinding of personnel (performance bias)
Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Blinding of outcome assessment (detection bias)
Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Incomplete outcome data (attrition bias)
Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Selective reporting (reporting bias)
Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Embedded Image Other bias
Random sequence generation
Allocation concealment
Blinding of participants
Blinding of personnel
Blinding of outcome assessment
Incomplete outcome data
Selective reporting
Other bias
Embedded Image
  • Embedded Image=low risk; Embedded Image=unclear risk of bias; Embedded Image=high risk of bias.