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Table 4 Average weekly rate of coronary artery bypass procedure in relation to calendar period of decision to proceed with surgery, for patients registered on a wait list

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 1726 1519 20462 7.4 (7.1–7.8) 1.7 (1.6–1.9) 2.0 (1.9–2.2)
 1994–1995 1793 1545 26452 5.8 (5.5–6.1) 1.3 (1.2–1.4) 1.4 (1.3–1.5)
 1996–1997 1862 1555 35054 4.4 (4.2–4.7) 1.0   1.0  
 1998–1999 1610 1426 21266 6.7 (6.4–7.1) 1.5 (1.4–1.6) 1.5 (1.4–1.7)
 2000–2001 1791 1509 31887 4.7 (4.5–5.0) 1.1 (1.0–1.2) 1.1 (1.0–1.2)
 2002–2003 1889 1613 35447 4.6 (4.3–4.8) 1.0 (0.9–1.1) 1.0 (0.9–1.1)
 2004–2005 1359 1172 14252 8.2 (7.8–8.7) 1.9 (1.7–2.0) 1.9 (1.8–2.1)
 All periods 12030 10339 184820 5.6 (5.5–5.7)   
  1. Abbreviations: OR = odds ratio; CI = confidence interval.
  2. *To measure waiting times, patients were followed for a maximum of 52 weeks.
  3. Per 100 patient weeks 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 weeks of waiting (0.5–52 weeks).
  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. 218 patients with unknown values for urgency at decision were excluded.