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

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

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)	–		–

Abbreviations: OR = odds ratio; CI = confidence interval.
^*To measure waiting times, patients were followed for a maximum of 52 weeks.
^‡Per 100 patient weeks calculated as the number of procedures performed divided by the sum of waiting times.
^†As measured by odds ratios derived from discrete-time survival models, adjusting for consecutive weeks of waiting (0.5–52 weeks).
^§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.
^∥218 patients with unknown values for urgency at decision were excluded.

ISSN: 1472-6963