Table 1 Pre-operative Characteristics of the Study and Simulation Cohorts
Characteristic | Study Cohort (n = 5631) | Simulation Cohort (n = 3000) |
|---|---|---|
Age, mean (SD) | 66.7 (9.9) | 67.0 (9.2) |
Sex (female) | 3307 (58.7) | 1754 (58.4) |
Body Mass Index | ||
 < 24.9 (underweight or normal weight) | 632 (11.2) | 314 (10.5) |
 25.0–29.9 (overweight) | 1696 (30.1) | 912 (30.4) |
 >  30 (obese) | 3305 (58.7) | 1774 (59.1) |
High Blood Pressure | 3020 (53.5) | 1613 (53.8) |
Back Pain | 2074 (36.8) | 1080 (36.0) |
Diabetes | 992 (17.6) | 494 (16.5) |
Depression | 761 (13.5) | 322 (10.7) |
Heart Disease | 663 (11.8) | 329 (11.0) |