Demographics and clinical characteristics: bivariate analysis with primary outcome as dependent variable
| Variable | Primary outcomes (n (%)) | p Value | Odds ratio | 95% CI |
|---|---|---|---|---|
| *Cardiovascular risk factors before hospital admission defined as a documented history of hypertension, dyslipidaemia, diabetes, or smoking habits reported in medical records. | ||||
| CI, confidence interval. | ||||
| Age (years) | 0.001 | |||
| <65 (n=544) | 13 (2.4) | – | 1 | – |
| 65–75 (n=385) | 12 (3.1) | 0.50 | 1.31 | 0.59 to 2.91 |
| ≥75 (n=318) | 38 (12) | 0.001 | 5.54 | 2.90 to 10.58 |
| Sex | ||||
| Men (n=892) | 36 (4.0) | – | 1 | – |
| Women (n=355) | 27 (7.6) | 0.009 | 1.96 | 1.17 to 3.28 |
| Diagnosis at entry | ||||
| Unstable angina (n=557) | 19 (3.4) | 1 | – | |
| Myocardial infarction (n=690) | 44 (6.4) | 0.01 | 1.93 | 1.11 to 3.34 |
| Left ventricular ejection fraction | 0.001 | |||
| >40% (n=983) | 40 (4.0) | – | 1 | – |
| ≤40% (n=129) | 15 (11.6) | 0.0004 | 3.1 | 1.66 to 5.79 |
| Unavailable (n=135) | 8 (5.9) | 0.32 | 1.48 | 0.68 to 3.24 |
| Previous history of myocardial infarction | ||||
| No (n=969) | 40 (4.1) | – | 1 | – |
| Yes (n=278) | 23 (8.3) | 0.005 | 2.09 | 1.23 to 3.56 |
| Previous history of peripheral artery disease | ||||
| No (n=1122) | 50 (4.5) | – | 1 | – |
| Yes (n=125) | 13 (10.4) | 0.004 | 2.49 | 1.31 to 4.72 |
| Previous history of stroke | ||||
| No (n=1182) | 56 (4.7) | – | 1 | – |
| Yes (n=68) | 7 (10.8) | 0.04 | 2.43 | 1.06 to 5.56 |
| Cardiovascular risk factors before hospital admission* | ||||
| Smoking | ||||
| No (n=757) | 47 (6.2) | – | 1 | – |
| Yes (n=490) | 16 (3.3) | 0.02 | 0.51 | 0.29 to 0.91 |
| Dyslipidaemia | ||||
| No (n=668) | 42 (6.3) | – | 1 | – |
| Yes (n=579) | 21 (3.6) | 0.03 | 0.56 | 0.33 to 0.96 |
| Diabetes | ||||
| No (n=986) | 40 (4.0) | – | 1 | – |
| Yes (n=261) | 23 (8.8) | 0.001 | 2.29 | 1.34 to 3.89 |