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Table 5 Meta-regression for variables that influence the association between smoking and risk of wound complications

From: Risk factors for wound complications of closed calcaneal fractures after surgery: a systematic review and meta-analysis

Variables Study variance (ţ 2 ) P value Residual variation due to heterogeneity (I 2 )
Publication year 1.04 0.75 80.85%
Study design 0.86 0.26 79.73%
Operative approach 1.06 0.89 80.70%
Type of closure 0.94 0.35 78.99%
Study quality 0.78 0.18 74.83%
Study region 0.88 0.26 78.71%