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Table 3 Weekly rate of all-cause preoperative death, unplanned emergency surgery, and planned surgery in relation to urgency group, for patients registered for bypass surgery in 1992–2005, as measured by odds ratios derived from discrete-time survival regression models*

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

   Preoperative deaths Emergency surgeries Planned surgeries
Group Total wait† No. of events Event rate‡ (95% CI) OR§ (95% CI) No. of events Event rate‡ (95% CI) OR|| (95% CI) No. of events Event rate‡ (95% CI) OR|| (95% CI)
Urgent 4,676 4 0.9 (0.0–1.7) 48 10.3 (7.4–13.2) 4.9 (3.4–7.2) 655 140.1 (129.3–150.8) 2.2 (2.0–2.5)
Semiurgent 123,138 63 0.5 (0.4–0.6) 1.0 264 2.1 (1.9–2.4) 1.0 7512 61.0 (59.6–62.4) 1.0
Nonurgent 53,232 32 0.6 (0.4–0.8) 1.1 (0.7–1.7) 65 1.2 (0.9–1.5) 0.7 (0.5–1.0) 1627 30.6 (29.1–32.0) 0.7 (0.6–0.7)
  1. Abbreviations: CI = confidence interval, OR = odds ratio.
  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. †Waiting time measured in patient-weeks.
  4. ‡Weekly event rate was calculated as the number events divided by the sum of waiting times (per 1000 patient-weeks).
  5. §Adjusted for sex, age decade, comorbidities at registration, calendar period of registration, and time between catheterization and registration.
  6. ||Adjusted for sex, age group, coronary anatomy, comorbidities at registration, calendar period at registration, institution at registration, institution at catheterization, mode of admission at catheterization, urgency at admission for catheterization, and time between catheterization and registration.