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Table 1 Characteristics of patients in colon and rectal surgery

From: Risk factors and outcomes of organ-space surgical site infections after elective colon and rectal surgery

Variable Colon (n = 2518) Rectum (n = 1183) p-value
Age, median (IQR) years 70.6 (62–79) 68 (60–76) <0.001
Age ≥65, n (%) 1711 (67.95%) 724 (61.20%) 0.001
Males, n (%) 1494 (59.33%) 795 (67.20%) 0.001
ASA III-IV, n (%) 1062 (42.18%) 434 (36.69%) 0.002
Neoplasia, n (%) 2355 (93.5%) 1147 (97%) <0.001
Inflammatory bowel disease, n (%) 75 (3%) 16 (1.4%) 0.003
Other, n (%) 86 (3.4%) 17 (1.4%) 0.001
Duration of surgery ≥75th-percentilea, n (%) 947 (37.61%) 505 (42.69%) 0.003
NNIS Risk index 1–2, n (%) 909 (36.10%) 398 (33.64%) 0.15
Laparoscopy, n (%) 1515 (60.17%) 782 (66.10%) 0.001
Correct IV antibiotic prophylaxis, n (%) 2117 (84.07%) 966 (81.66%) 0.41
Previous radiotherapy, n (%) 33 (1.31%) 545 (46.07%) <0.001
Previous chemotherapy, n (%) 78 (3.10%) 533 (45.05%) <0.001
Oral antibiotic prophylaxis, n (%) 1078 (42.81%) 489 (41.34%) 0.41
Mechanical bowel preparation, n (%) 1749 (69.46%) 1038 (87.74%) <0.001
- Missing 58 (2.30%) 20 (1.69%)  
Ostomy, n (%) 208 (8.26%) 754 (63.74%) <0.001
  1. IQR interquartile range, ASA American Society of Anesthesiologists physical status classification, NNIS National Nosocomial Infections Surveillance, IV intravenous
  2. aGreater than 75th percentile for the duration of surgery (180 min, 3 h)