| Discharges | 7948 | 2770 | 5427 | 1200 | 2638 |
| Subjects | 7930 | 2733 | 4843 | 1175 | 2629 |
| Subjects with multiple discharges | 18 | 36 | 582 | 23 | 9 |
| City of residence | | | | | |
| Bologna | 584 | 276 | 599 | 79 | 251 |
| Milan | 2907 | 942 | 1709 | 374 | 980 |
| Rome | 3015 | 990 | 2470 | 573 | 1029 |
| Turin | 1442 | 562 | 649 | 174 | 378 |
| Sociodemographic characteristics (%) | | | | | |
| Women | 18.7 | 53.0 | 33.8 | 16.8 | 8.5 |
| 45–59 years age | 24.1 | 25.7 | 8.0 | 15.3 | 6.1 |
| 75+ years age | 14.0 | 18.3 | 31.7 | 22.3 | 31.6 |
| Area-based income index (quintiles) | | | | | |
| I high | 18.2 | 16.9 | 15.5 | 14.8 | 20.9 |
| II | 19.4 | 18.1 | 17.9 | 16.1 | 20.1 |
| III | 20.1 | 21.4 | 19.8 | 20.9 | 20.2 |
| IV | 20.9 | 21.7 | 22.6 | 21.4 | 20.8 |
| V low | 21.5 | 21.8 | 24.2 | 26.8 | 18.0 |
| Comorbidities (%) | | | | | |
| Cardiac and circulatory disease | 13.1 | 30.3 | 12.9 | 11.9 | 11.8 |
| Vascular disease including cerebrovascular | 6.8 | 5.8 | 9.8 | 10.8 | 6.6 |
| Hypertension | 24.1 | 9.8 | 17.1 | 11.4 | 10.8 |
| Pulmonary disease | 2.7 | 4.1 | 3.3 | 6.8 | 4.7 |
| Diabetes | 12.1 | 3.5 | 8.1 | 6.8 | 2.2 |
| Renal disease | 1.5 | 1.5 | 1.2 | 2.0 | 2.2 |
| Liver disease | 0.5 | 1.2 | 0.4 | 0.6 | 0.5 |
| Tumours | 0.7 | 0.9 | 1.0 | 2.2 | 2.2 |
| Organisational characteristics of hospital care (%) | | | |
| Public: high volume | 63.5 | 63.8 | – | – | – |
| Public: low volume | 14.3 | 15.4 | – | – | – |
| Private | 22.2 | 20.8 | – | – | – |
| Outcomes (%) | | | | | |
| In-hospital 30-day mortality | 3.7 | 5.7 | 0.9 | 8.8 | 4.0 |
| Cardiovascular complications | 5.1 | 6.4 | 5.3 | 11.8 | 5.3 |
| Non-cardiovascular complications | 5.4 | 7.1 | 2.1 | 13.8 | 9.2 |