Table 1 Baseline characteristics of all included patients and stratified by training and test dataset
All | Training dataset | Test dataset | |
|---|---|---|---|
n = 9786 | n = 4892 | n = 4894 | |
Demographics and medical history | |||
Age (years), median (IQR) | 66 (55–77) | 67 (55–76) | 66 (56–77) |
Sex, No. (%) | |||
Female | 3879 (39.6) | 1941 (39.7) | 1938 (39.6) |
Male | 5907 (60.4) | 2951 (60.3) | 2956 (60.4) |
BMI (kg/m2), median (IQR) | 26.1 (23.5–29.4) | 26.1 (23.5–29.4) | 26.1 (23.5–29.4) |
Diabetes, No. (%) | 3300 (33.7) | 1657 (33.9) | 1643 (33.6) |
Hypercholesterolemia, No. (%) | 936 (9.6) | 483 (9.9) | 453 (9.3) |
Arterial hypertension, No. (%) | 3595 (36.7) | 1819 (37.2) | 1776 (36.3) |
Chronic kidney disease (any stage), No. (%) | 2700 (27.6) | 1347 (27.5) | 1353 (27.6) |
Renal replacement therapy, No. (%) | 1454 (14.9) | 694 (14.2) | 760 (15.5) |
NIV/IMV, No. (%) | 4680 (47.8) | 2368 (48.4) | 2322 (47.4) |
Main diagnosis1, No. (%) | |||
Diseases of the digestive system | 835 (8.5) | 414 (8.5) | 421 (8.6) |
Diseases of the nervous system | 250 (2.6) | 129 (2.6) | 121 (2.5) |
Injury, poisoning and certain other consequences of external causes | 1065 (10.9) | 529 (10.8) | 536 (11.0) |
Certain infectious and parasitic diseases | 365 (3.7) | 173 (3.5) | 192 (3.9) |
Diseases of the circulatory system | 3315 (33.9) | 1669 (34.1) | 1646 (33.6) |
Neoplasms | 1630 (16.7) | 834 (17.0) | 796 (16.3) |
Diseases of the respiratory system | 1235 (12.6) | 607 (12.4) | 628 (12.8) |
Diseases of the genitourinary system | 270 (2.8) | 122 (2.5) | 148 (3.0) |
Other | 821 (8.4) | 414 (8.5) | 406 (8.3) |
Admission category, No. (%) | |||
Medical | 4420 (45.2) | 2217 (45.3) | 2203 (45.0) |
Scheduled surgery | 784 (8.0) | 385 (7.9) | 399 (8.2) |
Unscheduled surgery | 3362 (34.4) | 1669 (34.1) | 1693 (34.6) |
Other | 1220 (12.5) | 621 (12.7) | 599 (12.2) |
Admission source, No. (%) | |||
Emergency Room | 3031 (31.0) | 1546 (31.6) | 1485 (30.3) |
Other ICU | 2247 (23.0) | 1123 (23.0) | 1124 (23.0) |
Hospital ward | 3152 (32.2) | 1556 (31.8) | 1596 (32.6) |
External hospital | 887 (9.1) | 431 (8.8) | 456 (9.3) |
Other | 469 (4.8) | 236 (4.8) | 233 (4.8) |
Length of ICU stay | |||
1 day, No. (%) | 3032 (31.0) | 1500 (30.7) | 1509 (30.8) |
2 days, No. (%) | 1589 (16.2) | 797 (16.3) | 792 (16.2) |
≥ 3 days, No. (%) | 5165 (52.8) | 2595 (53.0) | 2570 (52.5) |
Length of ICU stay (days), median (IQR) | 3.3 (1.8–8.0) | 3.3 (1.8–8.0) | 3.2 (1.8–8.0) |
Mortality, No. (%) | |||
ICU mortality | 1528 (15.6) | 740 (15.1) | 788 (16.1) |
In-hospital mortality | 2684 (27.4) | 1338 (27.4) | 1346 (27.5) |
