CRP and abscess: The risk score (0−7) (AUC=0.82, 95 % confidence interval [CI] 0.77–0.88) outperformed CRP (AUC=0.73, 95 % CI 0.66–0.80, p = 0.001), maximal abscess diameter (AUC=0.72, 95 % CI 0.64–0.80, p < 0.001), and RPE (AUC=0.71, 95 % CI 0.65–0.77, p < 0.001).