Mortality outcomes for all procedures combined, by day of the week of surgery
| Outcome | Monday (n = 77 082) | Tuesday (n = 95 654) | Wednesday (n = 86 853) | Thursday (n = 78 171) | Friday (n = 65 139) | p value* |
|---|---|---|---|---|---|---|
| 30-day mortality | ||||||
| No. (%) of events | 622 (0.8) | 809 (0.8) | 719 (0.8) | 646 (0.8) | 595 (0.9) | – |
| Unadjusted OR (95% CI) | 1.00 (ref) | 1.05 (0.94–1.16) | 1.03 (0.92–1.14) | 1.02 (0.92–1.14) | 1.13 (1.01–1.27) | 0.2 |
| Adjusted OR† (95% CI) | 1.00 (ref) | 1.02 (0.91–1.14) | 0.97 (0.87–1.08) | 1.01 (0.90–1.13) | 1.08 (0.97–1.21) | 0.4 |
| 2-day mortality | ||||||
| No. (%) of events | 112 (0.1) | 126 (0.1) | 112 (0.1) | 107 (0.1) | 85 (0.1) | – |
| Unadjusted OR (95% CI) | 1.00 (ref) | 0.91 (0.70–1.17) | 0.89 (0.68–1.15) | 0.94 (0.72–1.23) | 0.90 (0.68–1.19) | 0.9 |
| Adjusted OR† (95% CI) | 1.00 (ref) | 0.90 (0.69–1.17) | 0.85 (0.66–1.09) | 0.93 (0.71–1.20) | 0.87 (0.65–1.16) | 0.8 |
| In-hospital mortality | ||||||
| No. (%) of events | 516 (0.7) | 679 (0.7) | 597 (0.7) | 540 (0.7) | 482 (0.7) | – |
| Unadjusted OR (95% CI) | 1.00 (ref) | 1.06 (0.95–1.19) | 1.03 (0.91–1.16) | 1.03 (0.91–1.16) | 1.11 (0.98–1.25) | 0.6 |
| Adjusted OR† (95% CI) | 1.00 (ref) | 1.02 (0.91–1.16) | 0.97 (0.86–1.09) | 1.02 (0.90–1.15) | 1.05 (0.93–1.19) | 0.8 |
| 90-day mortality | ||||||
| No. (%) of events | 1075 (1.4) | 1387 (1.5) | 1235 (1.4) | 1151 (1.5) | 1027 (1.6) | – |
| Unadjusted OR (95% CI) | 1.00 (ref) | 1.04 (0.96–1.13) | 1.02 (0.94–1.11) | 1.06 (0.97–1.15) | 1.13 (1.04–1.23) | 0.050 |
| Adjusted OR† (95% CI) | 1.00 (ref) | 1.02 (0.93–1.12) | 0.97 (0.89–1.05) | 1.05 (0.96–1.15) | 1.09 (1.00–1.19) | 0.07 |
Note: CI = confidence interval, OR = odds ratio, ref = reference category.
↵* p values represent an overall test of significance, not a comparison of individual odds ratios.
↵† Adjusted for patient age, sex, expected resource utilization, neighbourhood income quintile, hospital teaching status, type of procedure, year of procedure, years of surgeon experience and procedure-specific annual volume of surgeon.