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Table 1 Demographic characteristics at initial surgery S0, and interval antibiotic therapy in the 100 patients with PP.

From: Risk factors for multidrug resistant bacteria and optimization of empirical antibiotic therapy in postoperative peritonitis

Variable Patients with MDR bacteria (n = 41) Patients with other bacteria (n = 59) P
Age (year), mean ± SD 63 ± 17 60 ± 16 0.37
Gender, male, n (%) 24 (59) 32 (54) 0.83
Severity of underlying disease    
   Fatal (within 5 years), n (%) 16 (39) 21 (36) 0.92
   Malignancy, n (%) 17 (41) 22 (37) 0.86
   Diabetes mellitus, n (%) 7 (17) 11 (19) 0.91
   Steroids or immunosuppressive therapy, n (%) 15 (37) 27 (46) 0.36
Initial surgery    
   In emergency, n (%) 20 (49) 15 (25) 0.01
   Contaminated or infected wound class, n (%) 25 (61) 19 (32) 0.016
   Prior hospitalization (within 3 months prior S0), n (%) 24 (59) 29 (49) 0.24
   Prior antibiotic therapy (within 3 months, prior S0), n (%) 18 (44) 13 (22) 0.02
Interval antibiotics, n (%) 33 (80) 35 (59) 0.026
Broad-spectrum interval antibiotics, n (%) 25 (61) 11 (19) 0.0001
  1. MDR, multidrug resistant; PP, postoperative peritonitis; SD, standard deviation; S0, initial abdominal surgery.