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Table 2 Baseline characteristics according to preoperative hemoglobin value

From: Hemoglobin and B-type natriuretic peptide preoperative values but not inflammatory markers, are associated with postoperative morbidity in cardiac surgery: a prospective cohort analytic study

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