Table 4.
Average weekly rate of undergoing the operation from wait list for isolated coronary artery bypass surgery in British Columbia 1991–2000 and adjusted rate ratios by registration period
Registration period | Number of operations | Total wait time, weeks | Crude Rate, per 100 | SE | Hazard ratio | 95% CI* |
1991–1992 | 1504 | 23047 | 6.5 | 0.2 | 1.00 | referent |
1993–1994 | 1646 | 25480 | 6.5 | 0.2 | 1.00 | 0.93, 1.08 |
1995–1996 | 1727 | 34186 | 5.1 | 0.1 | 0.70 | 0.65, 0.76 |
1997–1998 | 1613 | 30384 | 5.3 | 0.1 | 0.77 | 0.71, 0.83 |
1999–2000 | 1501 | 24029 | 6.2 | 0.2 | 0.94 | 0.88, 1.02 |
All periods | 7991 | 137126 | 5.8 | 0.1 | - | - |
Abbreviations: SE = standard error; CI = confidence interval
*adjusted for priority group and comorbidity; stratified by age and sex
**0 patients were on the wait list on December 31 2001