Table 2.
Baseline characteristics categorical level data with χ2 used and interval data one-way analysis of variance.
| Characteristic | Overall | A | AB | B | O | P value |
| Number (%) | n=7340 | 3008 (41.0%) | 221 (3.0%) | 775 (10.6%) | 3336 (45.4%) | – |
| Mean age, years (SD) | 58.8 (17.2) | 59.3 (17.1) | 58 (16.6) | 58.8 (17.3) | 58.5 (17.3) | 0.245 |
| Female, % (n) | 41.7% (3063) | 41.7% (1255) | 36.2% (80) | 43.7% (339) | 41.7% (3063) | 0.508 |
| BMI, mean (SD) | 27.05 (6.4) | 27.1 (6.3) | 26.8 (6.8) | 27 (7.2) | 27.1 (6.2) | 0.894 |
| Surgery during admission, % (n) | 46.3% (3399) | 46.5% (1398) | 41.6% (92) | 44.6% (346) | 46.9% (1563) | 0.356 |
| Days in hospital, mean (SD) | 30.2 (45.2) | 31.5 (53.0) | 29.0 (28.1) | 28.2 (37.2) | 29.6 (39.9) | 0.202 |
| % Caucasian (n) | 95.5% (7013) | 97.1% (2922) | 95.5% (211) | 90.3% (700) | 95.3% (3180) | 0.000 |
| APACHE score, mean (SD) | 13.45 (7.86) | 13.59 (7.87) | 13.39 (7.62) | 13.52 (8.26) | 13.30 (7.77) | 0.528 |
BMI, body mass index.