Table 2.

Quality assessment based on SORT-criteria ²⁶

Article	Randomizationa	Blinding providersb	Blinding patientsc	ITTd	Adequate size	Missing datae	Level of evidencef
Chassany34	−	−	−	+	+	+	2
Cooper32	+	−	+	+	−	+	2
Kinmonth28	+	−	+	+	+	−	2
Krones30	+	−	+	+	+	−	2
Légaré33	+	−	+	+	+	−	2
Loh31	−	−	+	−	−	−	2
Pill29	+	−	−	−	+	−	2

^a+: low risk of bias; −: high risk of bias or insufficient information to judge the risk.

^b+: providers blinded; −: providers not blinded or insufficient information to judge provider blinding.

^c+: patients blinded; −: patients not blinded or insufficient information to judge patient blinding.

^d+: ITT analysis performed; −: ITT analysis not performed or insufficient information available to judge ITT analysis.

^e+: missing data <20%; −: missing data> 20%.

^fQuality level based on the SORT criteria.²⁶