Univariate analyses identified variables with a potential independent correlation with postoperative complications, indicating the following: sex (p = 0.027), hypertension (p = 0.013), surgical approach (p < 0.001), low muscle reserve (p = 0.007), age (p = 0.018), maximum perforation diameter (p < 0.001), WBC (p = 0.014), PLT (p = 0.038), FIB (p = 0.009), D-dimer (p < 0.001), CRP (p = 0.006), and time from onset to anti-infection (p = 0.046). Here, CRP is linked to infection.