No. of patients (%) | No. of patients with surgery (%) | Unadjusted OR (95% CI) | Adjusted OR (95% CI)* | χ2 p value log-likelihood ratio test | |
---|---|---|---|---|---|
Surgical centre annual catchment population | |||||
<400 | 7566 (8) | 1122 (15) | 1 | 1 | |
400–700 | 15 581 (16) | 1929 (12) | 0.81 (0.74 to 0.87) | 0.87 (0.78 to 0.97) | |
700–1100 | 33 009 (34) | 4464 (14) | 0.89 (0.83 to 0.96) | 0.87 (0.79 to 0.95) | |
>1100 | 39 662 (41) | 5244 (13) | 0.87 (0.81 to 0.93) | 0.88 (0.80 to 0.96) | 0.06 |
No. of cardiothoracic surgeons on-site | |||||
≤3 surgeons | 26 493 (28) | 3517 (13) | 1 | 1 | |
>3–≤5 surgeons | 51 579 (64) | 8095 (13) | 0.98 (0.94 to 1.03) | 0.99 (0.93 to 1.05) | |
>5 surgeons | 7746 (8) | 1147 (15) | 1.13 (1.05 to 1.22) | 0.99 (0.90 to 1.09) | 0.88 |
*Adjusted for patient features only.