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

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

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)	–		–

Abbreviations: OR = odds ratio; CI = confidence interval.
^*To measure waiting times, patients were followed for a maximum of 7 days.
^‡Per 100 patient days 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 days of waiting (0–7 days).
^§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.
^∥1 patient with unknown value for sex was excluded.

ISSN: 1472-6963