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Fig. 4 | BMC Medical Research Methodology

Fig. 4

From: Predicting postoperative surgical site infection with administrative data: a random forests algorithm

Fig. 4

Receiver Operator Characteristics Curve (ROC curve) and *calibration plot for the full model with risk scores for hospitalization diagnostic (ICD-10) codes, physician diagnostic (ICD-9) codes, and physician procedure claims, adjusted for the **study covariates, in the validation cohort. *In the calibration plot, the observed percentage of patients having an SSI within 30 days of surgery is plotted against the predicted SSI risk from the SSI risk model (horizontal axis). **Study covariates: surgical specialties, age, sex, duration of surgery, emergency case, ASA class, concurrent surgical procedures

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