Table 2.

Classification scheme of bias in RCTs [ 22 ]

Type of bias	Prevention/elimination of bias
▪ Selection bias	Proper randomization
▪ Performance bias	Blinding of participants and people administering treatment
▪ Detection bias	Blinding of outcome assessors/analyzers
▪ Attrition bias	Blinding participants, intention-to-treat analysis
▪ Publication bias	Trial registration, no selective reporting
▪ Other biases	No selective reporting, meticulous study design