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For inferential analysis, CS grades were merged into G1 and G2 (reference); and G3 and G4. Smoking status was merged into non-smoker (reference); and current/ex-smoker. Diabetes status was merged into no diabetes (reference); and any kind of diabetes. Grade of surgeon was merged into registrar (reference) and Other.
Regression parameters from a series of uni-variable binary logistic regression analyses conducted on all included variables are summarised in Table 2.