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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

From: Time on wait lists for coronary bypass surgery in British Columbia, Canada, 1991 – 2000

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 - -
  1. Abbreviations: SE = standard error; CI = confidence interval
  2. *adjusted for priority group and comorbidity; stratified by age and sex
  3. **0 patients were on the wait list on December 31 2001