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Table 1 Patient characteristics of representative sample

From: Association between emergency department length of stay and adverse perioperative outcomes in emergency surgery: a cohort study in two Colombian University hospitals

  Total (n = 998) Center A (n = 653) Center B (n = 345) P
Gender, male 5111 (51.2) 353 (54.1) 158 (45.8) 0.013
Age (years) 62.4 (53.2–73.5) 62.4 (53.2–73.5) 62.3 (53.4–73) 0.797
Preoperative medical conditions
 Hypertension 396 (39.7) 278 (42.69 118 (34.2) 0.010
 Diabetes mellitus 137 (13.3) 89 (13.6) 48 (13.9 0.901
 Chronic renal disease 59 (5.9) 43 (6.6) 16 (4.6) 0.215
 Major cardiovascular diseaseb 252 (16.9) 200 (19.9) 52 (10.7) < 0.001
 COPD 62 (6.2) 51 (7.8) 11 (3.2) 0.014
 Active cancer 197 (13.3) 154 (15.4) 43 (8.9) < 0.001
 Major general surgery 236 (15.9) 179 (17.9) 57 (11.7) 0.002
Risk factors for 30-day mortalitya     0.006
 No risk factors 434 (43.5) 275 (42.1) 159 (46.1)  
 1 or 2 risk factors 433 (43.4) 276 (42.3) 157 (45.5)  
  ≥ 3 risk factors 131 (13.1) 102 (15.6) 29 (8.4)  
Preoperative interventions
 Medical assessments 6 (4–10) 7 (5–11) 4 (3–7) < 0.001
 Laboratories 8 (4–16) 11 (6–19) 6 (3–11) < 0.001
 Diagnostic images 2 (1–3) 2 (1–4) 2 (1–3) < 0.001
Type of surgery     < 0.001
 General 735 (73.6) 522 (79.9) 213 (61.7)  
 Orthopedic 263 (26.4) 131 (20.1) 132 (38.3)  
 ED LOS (hours) 24.6 (12.5–53.2) 24.2 (13.2–50.5) 24.8 (11–64.3) 0.965
 Duration of surgery (hours) 1.6 (1.3–2.3) 1.8 (1.3–2.4) 1.5 (1.1–2) < 0.001
  1. Data are presented as median (interquartile range), or absolute number (%)
  2. PVD Peripheral vascular disease, COPD Chronic obstructive pulmonary disease, ED Emergency department, LOS Length of stay
  3. aRisk factors as defined by VISION study [3]: Age ≥ 65 years, history of coronary artery disease, congestive heart failure, PVD, stroke, COPD, active cancer and major general surgery
  4. bIncludes history of coronary artery disease, stroke, heart failure, peripheral vascular disease
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