Distribution of major prognostic variables in patients by classification system of confirmed myocardial infarction
| Frequency of prognostic variable by classification system for confirmed MI (%) | ||||
|---|---|---|---|---|
| Prognostic variables | Original NHAR group (n=723) | Amended NHAR group (n=1224) | MONICA (n=1051) | UKHAS (n=807) |
| *p < 0.05 between frequency of variable in that classification and frequency in at least one alternative classification. | ||||
| CI, confidence interval; NHAR, Nottingham heart attack register; MI, myocardial infarction; MONICA, monitoring trends and determinants in cardiovascular disease study; OXMIS, Oxford myocardial infarction study; UKHAS, United Kingdom heart attack study. | ||||
| Median age (years) | 67 | 68 | 68 | 67 |
| Past history of MI | 19.9* | 24.5* | 24.3* | 22.2 |
| Heart failure on presentation | 10.7* | 10.3* | 9.8 | 8.3* |
| Male sex | 61.0* | 62.3* | 62.4* | 65.7* |
| Abnormal ECG | 98.6* | 95.3* | 96.6* | 95.5* |
| Abnormal cardiac enzymes | 89.6* | 83.6* | 91.8* | 100* |
| Diuretic use at discharge | 26.1* | 31.5* | 29.9* | 28.0* |
| Aspirin use at discharge | 65.0* | 65.2* | 67.9 | 69.8* |
| β Blocker use at discharge | 30.8* | 31.9 | 33.1 | 34.7* |