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Table 6 Odds ratios of preoperative death, unplanned emergency surgery, and planned surgery for patient and center factors, for patients registered for bypass surgery in 1992–2005, derived from regression models for cumulative incidence functions*

From: The occurrence of adverse events in relation to time after registration for coronary artery bypass surgery: a population-based observational study

Factor Preoperative deaths OR (95% CI) Emergency surgeries OR (95% CI) Planned surgeries OR (95% CI)
Urgency group at registration    
 Urgent NA1 2.49 (1.71–3.61) 3.94 (3.36–4.62)
 Semiurgent 1.00 1.00 1.00
 Nonurgent 1.92 (1.25–2.95) 0.88 (0.64–1.20) 0.52 (0.48–0.57)
Sex    
 Men 1.00 1.00 1.00
 Women 0.51 (0.27–0.98) 1.14 (0.87–1.49) 0.86 (0.78–0.93)
Age decade 1.26 (1.00–1.59) NA2 NA2
Age group (years)    
 <50 NA2 1.20 (0.79–1.83) 1.12 (0.98–1.28)
 50–59 NA2 1.00 1.00
 60–69 NA2 0.99 (0.75–1.32) 1.05 (0.97–1.15)
 70–79 NA2 1.14 (0.85–1.54) 1.04 (0.95–1.13)
 ≥80 NA2 1.09 (0.57–2.10) 0.69 (0.56–0.85)
Coronary anatomy at registration    
 Left main NA3 0.73 (0.50–1.05) 1.36 (1.23–1.50)
 Multivessel† NA3 1.00 1.00
 Limited‡ NA3 1.24 (0.89–1.73) 1.30 (1.17–1.45)
Comorbidity at registration    
 Major conditions§ 1.90 (1.06–3.41) 1.15 (0.87–1.51) 0.81 (0.74–0.89)
 Other conditions|| 1.00 1.00 1.00
 None 1.08 (0.62–1.89) 1.05 (0.79–1.39) 0.77 (0.71–0.84)
Calendar Period at registration    
 1992–1996 1.31 (0.83–2.07) 1.03 (0.81–1.30) 1.40 (1.30–1.51)
 1997–2001 1.00 1.00 1.00
 2002–2005 0.83 (0.48–1.44) 0.76 (0.57–1.03) 1.05 (0.97–1.14)
Institution at registration    
 1 NA3 1.84 (1.16–2.91) 0.50 (0.42–0.58)
 2 NA3 1.00 1.00
 3 NA3 1.16 (0.69–1.93) 0.38 (0.33–0.44)
 4 NA3 0.92 (0.33–2.62) 1.97 (1.45–2.68)
Institution from where catheterization was booked    
 1 NA3 0.63 (0.40–1.01) 1.28 (1.09–1.51)
 2 NA3 1.00 1.00
 3 NA3 0.97 (0.57–1.66) 0.99 (0.85–1.15)
 4 NA3 0.86 (0.30–2.47) 0.73 (0.53–1.00)
 Other NA3 0.26 (0.15–0.45) 1.36 (1.20–1.54)
Mode of admission for catheterization    
 Emergency department NA3 5.94 (4.05–8.71) 0.83 (0.70–0.98)
 Otherwise¶ NA3 1.00 1.00
Urgency at admission for catheterization    
 Elective NA3 1.13 (0.79–1.62) 0.70 (0.63–0.77)
 Emergency or urgent NA3 1.00 1.00
Time between catheterization and registration    
 Per week 1.02 (0.99–1.04) NA2 NA2
 0–1 weeks NA2 1.07 (0.79–1.45) 1.17 (1.07–1.29)
 2–3 NA2 1.00 1.00
 4–5 NA2 1.14 (0.74–1.77) 1.05 (0.92–1.19)
 6–7 NA2 1.08 (0.64–1.82) 0.83 (0.71–0.97)
 ≥8 NA2 0.96 (0.65–1.43) 0.82 (0.73–0.92)
  1. Abbreviations: OR = odds ratio, CI = confidence interval, NA1 = urgent patients were excluded from this analysis, NA2 = age was entered with alternative coding (continuous versus categorical), NA3 = not enough events per regression variable.
  2. *Did not include 218 patients for whom urgency was not provided: 5 died, 5 had unplanned emergency surgery, 163 underwent planned surgery, 45 removed for other reasons.
  3. †Two or three-vessel disease with stenosis of the proximal left anterior descending (PLAD) artery.
  4. ‡Two-vessel disease with no stenosis of the PLAD artery or one-vessel disease with stenosis of the PLAD artery.
  5. §Congestive heart failure, diabetes mellitus, chronic obstructive pulmonary disease, rheumatoid arthritis, or cancer.
  6. ||Peripheral vascular disease, cerebrovascular disease, dementia, peptic ulcer disease, hemiplegia, renal disease, or liver disease.
  7. ¶Clinics or day surgery from reporting hospital, or direct patients from admitting department.