Table 2 Baseline characteristics according to preoperative hemoglobin value
Hemoglobin (g/dL) | Quintile 1 (8.8–13.2) (n = 114) | Quintile 2 (13.3-14.2) (n =113) | Quintile 3 (14.3-15.1) (n =118) | Quintile 4 (15.2 – 16) (n = 108) | Quintile 5 (16.1-20.2) (n = 101) | Trend test |
|---|---|---|---|---|---|---|
Mean age (SD) | 62.3 (11.9) | 61.6 (10.9) | 59.9 (11.2) | 58.7 (9.3) | 57.3 (11.9) | P = 0.001 |
Males (%) | 37.7 | 63.7 | 78.8 | 95.3 | 97.0 | P = 0.001 |
Residents in a city with an altitude of 2000 to 3000 m (%) | 72.8 | 84.0 | 83.9 | 82.4 | 88.1 | P = 0.01 |
Mean ejection fraction (%) | 50.7 | 53.3 | 52.4 | 52.6 | 51.3 | P = 0.89 |
Diabetes mellitus (%) | 25.4 | 17.7 | 18.6 | 17.6 | 20.7 | P = 0.4 |
Acute coronary syndrome ≤ 30 days (%) | 44.7 | 34.5 | 32.2 | 30.5 | 27.7 | P = 0.01 |
Obesity (%) | 14.9 | 17.7 | 16.1 | 20.3 | 20.8 | P = 0.22 |
Previous cardiac surgery (%) | 6.1 | 4.4 | 10.1 | 3.7 | 7.9 | P = 0.71 |
Proportion of patients undergoing CABG (%) | 68.4 | 67.2 | 71.2 | 72.2 | 70.3 | P = 0.09 |