Table 4. Sensitivity analysis.

Study Omitted	RR	95% CI
George et al. [2018]	1.602	1.420–1.808
Smith et al. [2018]	1.555	1.403–1.724
Shohat et al. [2018]	1.584	1.415–1.773
Jung et al. [2017] (THA)§	1.571	1.408–1.754
Jung et al. [2017] (TKA)§	1.567	1.409–1.743
Lübbeke et al. [2016]	1.599	1.430–1.789
Bohl et al. [2016]	1.556	1.385–1.748
Tornero et al. [2015]	1.591	1.425–1.777
Wu et al. [2014]	1.563	1.405–1.739
Wallace et al. [2014] (THA)¶	1.616	1.425–1.833
Wallace et al. [2014] (TKA)¶	1.622	1.504–1.749
Namba et al. [2012]	1.528	1.386–1.684
Grant et al. [2008]	1.581	1.418–1.763
Combined	1.579	1.421–1.755

^§, this study reported the results of THA and TKA separately; ^¶, this study reported the results of THA and TKA separately. THA, total hip arthroplasty; TKA, total knee arthroplasty; RR, relative risk; CI, confidence interval.