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.