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Table 2 The quality assessment of the included studies

From: Combined femoral and sciatic nerve block versus femoral and local infiltration anesthesia for pain control after total knee arthroplasty: a meta-analysis of randomized controlled trials

Author and year Random sequence generation Allocation concealment Blinding Incomplete outcome data Selective reporting Other sources of bias
Mahadevan, D 2012 [9] Unclear Opaque sealed envelopes Yes Yes No No
Safa, B 2014 [17] Computer generated Hospital investigational pharmacy Yes Yes No No
Tanikawa, H 2014 [18] Unclear Sealed envelopes Yes Yes No No
Gi, E 2014 [19] SPSS Sealed envelopes Yes Yes No No
Nagafuchi, M 2015 [20] Randomization web site Storing the treatment allocation Yes Yes No No
Uesugi, K 2014 [21] Unclear Opaque envelope Yes Yes Unclear Unclear
Spangehl, M. J 2015 [22] Computerized random number tables Opaque envelope Yes Yes No No