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Table 1 Study population demographics

From: External validation of the Surgical Outcome Risk Tool (SORT) in 3305 abdominal surgery patients in the independent sector in the UK

  All patients
N = 3305
N (%)
In-patient death
N = 29
N (%)
Survived to discharge
N = 3276
N (%)
Mean age (SD) 51.09 (15.88) 66.48 (9.38) 50.95 (15.86)
Male gender (M:F) 1592 (48.0) 18 (62.0) 1574 (48.0)
ASA
1 1199 (36.3) 2 (6.9) 1197 (36.5)
2 1581 (47.8) 5 (17.2) 1576 (48.1)
3 477 (14.4) 13 (44.8) 464 (14.2)
≥ 4 48 (1.5) 9 (31.0) 39 (1.2)
Elective admission 2783 (84.2) 16 (55.2) 2767 (84.5)
Type of surgery
Oesophagus 244 (7.38) 1 (3.5) 243 (7.42)
Stomach 310 (9.38) 0 (0.0) 310 (9.46)
Duodenum 34 (1.03) 0 (0.0) 34 (1.04)
Small intestine 189 (5.72) 2 (6.9) 187 (5.71)
Large intestine 812 (24.6) 4 (13.8) 808 (24.7)
Rectum 376 (11.4) 1 (3.45) 375 (11.4)
HPB 600 (18.2) 10 (34.5) 590 (18.0)
Othera 740 (22.4) 11 (37.9) 729 (22.3)
Severity of procedure
Intermediate 286 (8.65) 0 (0.0) 286 (8.73)
Major 1374 (41.6) 12 (41.4) 1362 (41.6)
Complex major/complex 1645 (49.8) 17 (58.6) 1628 (49.7)
Comorbidity
Mean Charlson Index (IQR) 0.692 (1) 3.59 (1) 0.667 (1)
Cancer (yes/no) 330 (10.0) 15 (52.0) 315 (9.6)
  1. aOther: laparotomy, retroperitoneal surgery, adhesionolysis, aortic surgery, adrenalectomy
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