Table 2. Agreement between CVD conditions and ICD-9 discharge codes, 2000–2002.
| Conditions | ICD-9 Codes | Chief complaint keywords | Prevalence (%) | Sensitivity | Specificity | PPV |
| Myocardial infarction | 410 | Heart attack | 0.2 | 0.007 | 0.999 | 0.010 |
| Heart failure | 428 | CHF | <0.1 | 0.016 | 0.999 | 0.014 |
| Dysrhythmia | 427–429 | Heartbeat | 0.7 | 0.299 | 0.996 | 0.345 |
| Heart racing | ||||||
| Tachycardia | ||||||
| Stroke | 430–436 | CVA | 0.1 | 0.081 | 0.999 | 0.075 |
| Stroke | ||||||
| Chest pain | 411, 786.5 | Angina | 4.2 | 0.482 | 0.968 | 0.398 |
| Chest pain | ||||||
| Shortness of breath | 786.05 | Short of breath | 1.8 | 0.288 | 0.983 | 0.237 |
| Hypertension | 401–405 | Blood pressure | 0.6 | 0.119 | 0.997 | 0.193 |
| Hypertension |
+Prevalence defined by ICD-9 codes.