Table 1.
Baseline characteristics of patients on ICU admission (n = 14,483).
| Characteristics | Total | G1 | G2 | G3 | G4 | P -value |
|---|---|---|---|---|---|---|
| N = 827 | N = 4,626 | N = 3,808 | N = 5,206 | |||
| Age, years | 66.0 (57.0, 78.0) | 66.0 (56.0, 81.0) | 67.0 (58.0, 81.0) | 68.0 (58.0, 79.0) | 64.0 (55.0, 74.0) | <0.001 |
| Male, n (%) | 7,465.0 (51.5) | 408.0 (49.3) | 2,540.0 (54.7) | 2,084.0 (54.7) | 2,433.0 (46.7) | <0.001 |
| Race, n (%) | <0.001 | |||||
| Caucasian | 11,360.0 (78.4) | 628.0 (75.9) | 3,596.0 (77.5) | 2,983.0 (78.3) | 4,153.0 (79.8) | |
| American | 1,627.0 (11.2) | 123.0 (14.9) | 502.0 (10.8) | 397.0 (10.4) | 605.0 (11.6) | |
| Other/unknown | 1,496.0 (10.3) | 76.0 (9.2) | 544.0 (11.7) | 428.0 (11.2) | 448.0 (8.6) | |
| Height, cm | 168.0 (160.0, 177) | 169.0 (160.0, 178.0) | 169.0 (162.0, 178.0) | 170.0 (163.0, 178.0) | 168.0 (160.0, 177.0) | <0.001 |
| Weight, kg | 77.0 (63.0, 96.0) | 47.0 (42.0, 53.0) | 64.0 (57.0, 70.0) | 79.0 (71.0, 86.0) | 104.0 (91.0, 119.0) | <0.001 |
| BMI, kg/m2 | 27.1 (22.9, 33.1) | 17.2 (16.1, 17.9) | 22.3 (20.7, 23.7) | 27.3 (26.0, 28.5) | 35.6 (32.4, 41.2) | <0.001 |
| Severity scorea | ||||||
| APACHE IV | 68.0 (53.0, 86.0) | 71.0 (55.0, 88.0) | 69.0 (54.0, 87.0) | 69.0 (54.0, 86.0) | 66.0 (51.0, 84.0) | <0.001 |
| SOFA | 6.0 (4.0, 9.0) | 6.0 (4.0, 9.0) | 6.0 (4.0, 9.0) | 6.0 (4.0, 9.0) | 6.0 (4.0, 9.0) | 0.386 |
| ICU LOS, days | 2.9 (1.8, 5.1) | 2.8 (1.7, 4.5) | 2.8 (1.8, 5.0) | 2.9 (1.8, 5.1) | 3.0 (1.8, 5.5) | <0.001 |
| Hospital LOS, days | 7.9 (4.9, 13.3) | 7.4 (4.8, 12.9) | 7.9 (4.9, 13.1) | 7.8 (4.9, 13.0) | 8.0 (5.0, 13.9) | <0.001 |
| ICU mortality, n (%) | 1,419.0 (9.8) | 112.0 (13.5) | 477.0 (10.3) | 374.0 (9.8) | 456.0 (8.8) | <0.001 |
| Hospital mortality, n (%) | 2,320.0 (16.0) | 186.0 (22.5) | 804.0 (17.3) | 604.0 (15.9) | 726.0 (13.9) | <0.001 |
| ICU p-LOS, n (%) | 3,828.0 (26.4) | 827.0 (22.6) | 1,165.0 (25.1) | 996.0 (26.2) | 1,480.0 (28.4) | <0.001 |
Data are expressed as median (IQR), or n (%). Analysis of variance (or the Kruskal-Wallis test) and Chi-square (or Fisher's exact) tests were used for comparisons among groups. Statistical significance (P < 0.05); G1, BMI < 18.5; G2, 18.5 > BMI ≤ 25.0; G3, 25.0 > BMI ≤ 30.0; G4, BMI > 30.0.
a
Severe score is calculated on the first day of each ICU patients' stay.
BMI, body mass index; APACHE IV, acute physiology and chronic health evaluation IV; SOFA, sequential organ failure assessment; ICU, intensive care unit; LOS, length of stay; p-LOS, prolonged length of stay.