CRP and infection: On the fifth postoperative day, CRP greater than 12 mg/l (OR = 25.92; 95% CI: 2.17-332.71; p < 0.01) and IL-6 greater than 25 pg/ml (OR = 15.46; 95% CI: 1.19-230.30; p = 0.03) were the only variables associated with infection (Table 5).