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Table 5 Average daily rate of coronary artery bypass procedure in relation to calendar period of decision to proceed with surgery, for direct admissions

From: Evaluation of supply-side initiatives to improve access to coronary bypass surgery

Type of access by No. of No. of Total Crude rate Crude OR Adjusted OR†§
calendar period of decision patients procedures waiting time (95% CI) (95% CI) (95% CI)
 1992–1993 1204 1003 4228 23.7 (22.3–25.2) 0.7 (0.6–0.7) 0.7 (0.6–0.8)
 1994–1995 1474 1270 4489 28.3 (26.7–29.8) 0.8 (0.7–0.9) 0.9 (0.8–0.9)
 1996–1997 1621 1442 4173 34.6 (32.8–36.3) 1.0   1.0  
 1998–1999 2089 1920 5301 36.2 (34.6–37.8) 1.1 (1.0–1.2) 1.2 (1.1–1.3)
 2000–2001 2121 1895 5579 34.0 (32.4–35.5) 1.0 (0.9–1.1) 1.2 (1.1–1.3)
 2002–2003 1940 1740 5145 33.8 (32.2–35.4) 1.0 (0.9–1.1) 1.1 (1.0–1.2)
 2004–2005 2369 2140 6206 34.5 (33.0–35.9) 1.0 (1.0–1.1) 1.2 (1.1–1.3)
 All periods 12818 11410 35121 32.5 (31.9–33.1)   
  1. Abbreviations: OR = odds ratio; CI = confidence interval.
  2. *To measure waiting times, patients were followed for a maximum of 7 days.
  3. Per 100 patient days calculated as the number of procedures performed divided by the sum of waiting times.
  4. As measured by odds ratios derived from discrete-time survival models, adjusting for consecutive days of waiting (0–7 days).
  5. §Adjusted for sex, age at decision, urgency at decision, institution at decision, comorbidities at decision, coronary anatomy at decision, and time between catheterization and decision.
  6. 1 patient with unknown value for sex was excluded.