| | Variables | Total (n = 4133) | CABG (n = 3593) | PCI (n = 540) | value |
| | Age (n) (%) | | | | <0.001 | | Youth | 1847 (44.69) | 1601 (44.56) | 246 (45.56) | | | Middle aged | 1733 (41.93) | 1567 (43.61) | 166 (30.74) | | | The elder | 553 (13.38) | 425 (11.83) | 128 (23.70) | | | Sex (n) (%) | | | | <0.001 | | Male | 3113 (75.32) | 2751 (76.57) | 362 (67.04) | | | Female | 1020 (24.68) | 842 (23.43) | 178 (32.96) | | | Race (n) (%) | | | | <0.001 | | White | 2840 (68.72) | 2446 (68.08) | 394 (72.96) | | | Black | 131 (3.17) | 100 (2.78) | 31 (5.74) | | | Asian | 83 (2.01) | 76 (2.12) | 7 (1.30) | | | Hispanic or Latino | 101 (2.44) | 92 (2.56) | 9 (1.67) | | | Others | 978 (23.66) | 879 (24.46) | 99 (18.33) | | | Insurance (n) (%) | | | | 0.014 | | Government | 83 (2.01) | 70 (1.95) | 13 (2.41) | | | Medicaid | 183 (4.43) | 163 (4.54) | 20 (3.70) | | | Medicare | 2241 (54.22) | 1915 (53.30) | 326 (60.37) | | | Private | 1610 (38.95) | 1432 (39.86) | 178 (32.96) | | | Self-pay | 16 (0.39) | 13 (0.36) | 3 (0.56) | | | Marital (n) (%) | | | | <0.001 | | Married | 2674 (64.70) | 2368 (65.91) | 306 (56.67) | | | Unmarried | 559 (13.53) | 461 (12.83) | 98 (18.15) | | | DSW | 729 (17.64) | 609 (16.95) | 120 (22.22) | | | Others | 171 (4.14) | 155 (4.31) | 16 (2.96) | | | BMI (n) (%) | | | | 0.001 | | I: normal | 953 (23.06) | 817 (22.74) | 136 (25.19) | | | II: underweight | 46 (1.11) | 32 (0.89) | 14 (2.59) | | | III: overweight | 1618 (39.15) | 1406 (39.13) | 212 (39.26) | | | IV: obesity | 1516 (36.68) | 1338 (37.24) | 178 (32.96) | | | Length of stay (day), median (IQR) | 2.07 (1.20, 3.30) | 2.10 (1.20, 3.29) | 1.90 (1.15, 3.67) | 0.165 | | ECI, median (IQR) | 6.00 (−2.00, 13.00) | 6.00 (−2.00, 11.00) | 9.00 (1.00, 19.00) | <0.001 | | Urine output (ml), median (IQR) | 2088.00 (1510.00, 2858.00) | 2110.00 (1543.00, 2858.00) | 1912.50 (1268.75, 2833.75) | <0.001 | | Heartrate (min-1), median (IQR) | 84.00 (77.73, 90.48) | 84.77 (78.97, 90.91) | 75.31 (67.71, 85.28) | <0.001 | | SBP (mmHg), median (IQR) | 112.08 (106.53, 119.53) | 111.77 (106.58, 118.81) | 115.06 (106.03, 125.23) | <0.001 | | DBP (mmHg), median (IQR) | 57.15 (53.08, 61.83) | 56.71 (52.83, 60.93) | 62.48 (55.84, 69.78) | <0.001 | | Mean BP (mmHg), median (IQR) | 74.82 (71.07, 79.33) | 74.59 (71.07, 78.69) | 77.56 (71.01, 83.59) | <0.001 | | Resprate (min-1), median (IQR) | 16.83 (15.30, 18.78) | 16.68 (15.17, 18.54) | 18.17 (16.31, 20.25) | <0.001 | | Temperature (°C), median (IQR) | 36.82 (36.52, 37.14) | 36.83 (36.53, 37.15) | 36.69 (36.43, 37.03) | <0.001 | | SpO2 (%), median (IQR) | 98.13 (97.13, 98.96) | 98.23 (97.30, 99.00) | 97.14 (95.97, 98.29) | <0.001 | | Free calcium (mmol/L), median (IQR) | 1.15 (1.12, 1.19) | 1.15 (1.12, 1.19) | 1.13 (1.09, 1.18) | <0.001 | | pCO2 (mmHg), median (IQR) | 41.00 (37.00, 45.00) | 41.00 (38.00, 45.00) | 41.50 (37.00, 46.00) | 0.232 | | pH, median (IQR) | 7.40 (7.37, 7.44) | 7.41 (7.38, 7.44) | 7.38 (7.33, 7.42) | <0.001 | | pO2 (mmHg), median (IQR) | 380.00 (269.00, 433.00) | 390.00 (311.00, 437.00) | 155.00 (88.00, 338.25) | <0.001 | | Anion gap (mEq/L), median (IQR) | 13.00 (11.00, 15.00) | 13.00 (11.00, 15.00) | 15.00 (13.00, 17.25) | <0.001 | | Bicarbonate (mEq/L), median (IQR) | 25.00 (23.00, 27.00) | 25.00 (23.00, 27.00) | 24.00 (21.75, 26.00) | <0.001 | | Chloride (mEq/L), median (IQR) | 105.00 (102.00, 108.00) | 105.00 (102.00, 109.00) | 103.00 (100.00, 106.00) | <0.001 | | Creatinine (mEq/L), median (IQR) | 0.90 (0.80, 1.20) | 0.90 (0.80, 1.10) | 1.10 (0.80, 1.40) | <0.001 | | Glucose (mg/dL), median (IQR) | 125.00 (105.00, 157.00) | 123.00 (104.00, 153.00) | 138.00 (112.00, 186.25) | <0.001 | | Magnesium (mg/dL), median (IQR) | 2.00 (1.80, 2.20) | 2.00 (1.80, 2.20) | 1.90 (1.80, 2.10) | <0.001 | | Potassium (mg/dL), median (IQR) | 4.20 (3.90, 4.50) | 4.20 (3.90, 4.50) | 4.15 (3.80, 4.60) | 0.679 | | Sodium (mg/dL), median (IQR) | 139.00 (137.00, 141.00) | 139.00 (137.00, 141.00) | 138.00 (136.00, 140.00) | <0.001 | | Urea nitrogen (mg/dL), median (IQR) | 17.00 (14.00, 23.00) | 17.00 (14.00, 22.00) | 19.00 (14.00, 28.00) | <0.001 | | Hematocrit (%), median (IQR) | 34.90 (30.10, 39.20) | 34.60 (29.70, 38.90) | 37.00 (32.40, 40.90) | <0.001 | | Hemoglobin (g/dL), median (IQR) | 12.00 (10.19, 13.60) | 11.90 (10.19, 13.50) | 12.60 (10.90, 14.10) | <0.001 | | INR, median (IQR) | 1.20 (1.10, 1.40) | 1.20 (1.10, 1.40) | 1.20 (1.10, 1.30) | <0.001 | | Platelet count (K/uL), median (IQR) | 206.00 (162.00, 257.00) | 201.00 (159.00, 250.00) | 242.00 (195.00, 297.00) | <0.001 | | PT (s), median (IQR) | 13.50 (12.70, 14.80) | 13.50 (12.70, 14.80) | 13.30 (12.40, 14.60) | <0.001 | | PTT (s), median (IQR) | 30.50 (26.70, 39.00) | 30.40 (26.80, 37.90) | 30.65 (25.50, 57.50) | 0.294 | | RDW (%), median (IQR) | 13.60 (13.00, 14.20) | 13.50 (13.00, 14.20) | 13.90 (13.30, 15.03) | <0.001 | | Red blood cells (m/uL), median (IQR) | 3.93 (3.36, 4.45) | 3.89 (3.32, 4.42) | 4.18 (3.59, 4.65) | <0.001 | | White blood cells (k/uL), median (IQR) | 9.10 (7.00, 12.20) | 8.90 (6.90, 12.00) | 10.25 (8.30, 13.20) | <0.001 | | Ventilator (n) (%) | | | | <0.001 | | No | 738 (17.86) | 297 (8.27) | 441 (81.67) | | | Yes | 3395 (82.14) | 3296 (91.73) | 99 (18.33) | |
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CABG, coronary artery bypass grafting; PCI, percutaneous coronary intervention; IQR, interquartile-range; DSW divorced, separated, or widowed; BMI, body mass index; ECI, Elixhauser comorbidity index; SBP, systolic blood pressure; DBP, diastolic blood pressure; MBP, mean blood pressure; INR, international normalized ratio; PT, prothrombin time; PTT, partial thromboplastin time; RDW, red cell distribution width.
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