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Proportion of patients with high and low risk for an unstable angina pectoris in each of the CCSA grades.
| CCSA grade | Total number of patients (n) | Percentage of patients (%) | Low risk (%) | High risk (%) |
|---|---|---|---|---|
| Grade I | 410 | 58.6 | 100.0% | 0.0% |
| Grade II | 88 | 12.6 | 88.6% | 11.4% |
| Grade III | 120 | 17.1 | 80.0% | 20.0% |
| Grade IV | 82 | 11.7 | 76.8% | 23.2% |
Information on symptoms of heart disease were not completely available for 50 patients.
