Table 1 Characteristics of patients included in the study
Derivation cohort | Validation cohort | All patients | ||||
|---|---|---|---|---|---|---|
Total number | 270 054 | 269 331 | 539 385 | |||
Admission-precipitating diagnosis, n (%) | ||||||
Acute myocardial infarction | 10 421 (3.9) | 10 176 (3.8) | 20 597 (3.8) | |||
Congestive heart failure | 56 970 (21.1) | 56 927 (21.1) | 113 897 (21.1) | |||
Acute cerebrovascular disease | 89 983 (33.3) | 90 071 (33.4) | 180 054 (33.4) | |||
Gastrointestinal hemorrhage | 35 073 (13.0) | 34 429 (12.8) | 69 502 (12.9) | |||
Pneumonia | 68 387 (25.3) | 68 386 (25.4) | 136 773 (25.4) | |||
Septicemia | 9220 (3.4) | 9342 (3.5) | 18 562 (3.4) | |||
Male, n (%) | 155 273 (57.5) | 154 857 (57.5) | 310 130 (57.5) | |||
Age, mean (SD) | 74.1 (14.2) | 74.1 (14.2) | 74.1 (14.2) | |||
Age by category, n (%) | ||||||
<60 | 37 363 (13.8) | 37 425 (13.9) | 74 788 (13.9) | |||
60–69 | 47 235 (17.5) | 46 833 (17.4) | 94 068 (17.4) | |||
70–79 | 73 468 (27.2) | 73 509 (27.3) | 146 977 (27.2) | |||
80–89 | 84 965 (31.5) | 84 964 (31.5) | 169 929 (31.5) | |||
≥90 | 27 023 (10.0) | 26 600 (9.9) | 53 623 (9.9) | |||
Charlson comorbidity index, n (%) | ||||||
0 | 162 038 (60.0) | 161 597 (60.0) | 323 635 (60.0) | |||
1 | 34 307 (12.7) | 34 015 (12.6) | 68 322 (12.7) | |||
2 | 52 841 (19.6) | 52 688 (19.6) | 105 529 (19.6) | |||
≥3 | 20 868 (7.7) | 21 031 (7.8) | 41 899 (7.8) | |||
In-hospital death, n (%) | 25 638 (9.5) | 25 449 (9.4) | 51 087 (9.5) | |||
Length of stay in days, median (IQR) | 15 (9–29) | 15 (9–29) | 15 (9–29) | |||