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Comparison of areas under the receiver operating characteristic curve (AUROC) for complications due to infection. Fist model (orange line) included only age and gender of patients, second model (blue line): age, gender, and type of joint disease: osteoarthritis or rheumatoid arthritis. Last model (green line); all these factors plus other comorbidities associated with infection. Difference between AUROC significant (P < 0.05) for model 3 compared with model 1 and with 2
