Table 2.

Risk of bias of upper limb studies included in the meta‐analysis (“+” = low risk; “‐” = high risk; “?” = unclear risk)

Study	Random Sequence Generation	Allocation Concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting
Ang et al.50	+	+	?	+	+	+
Ang et al.36	+	+	?	+	+	+
Frolov et al.48	?	?	+	+	+	+
Kim et al.51	+	+	+	+	+	+
Leeb et al.49	+	+	?	?	+	?
Li et al.53	+	+	?	?	+	+
Mihara et al.52	+	+	+	+	+	+
Pichiorri et al.37	?	+	+	+	+	+
Ramos‐M et al.34	+	+	+	+	+	+