Table 2.
Prevalence (%) of Components of CHADS2 by ICD-9 set (restrictive/inclusive), number of diagnoses required and lookback period. TIA: transient ischemic attack
| Component Variant | Lookback Period | |||||
|---|---|---|---|---|---|---|
| 1 year | 2 years | 3 years | ||||
|
| ||||||
| 2 diagnoses | 1 diagnosis | 2 diagnoses | 1 diagnosis | 2 diagnoses | 1 diagnosis | |
| Congestive Heart Failure | ||||||
| More Restrictive | 17.2 | 24.5 | 21.7 | 28.2 | 23.7 | 30.3 |
| More Inclusive | 17.3 | 24.7 | 21.9 | 28.4 | 23.9 | 30.5 |
| Hypertension | ||||||
| More Restrictive | 61.6 | 76.9 | 73.7 | 81.6 | 77.0 | 83.8 |
| More Inclusive | 61.6 | 76.9 | 73.7 | 81.6 | 77.0 | 83.8 |
| Diabetes | ||||||
| More Restrictive | 30.2 | 34.3 | 32.7 | 35.5 | 33.4 | 36.1 |
| More Inclusive | 30.4 | 34.4 | 32.8 | 35.6 | 33.4 | 36.2 |
| Stroke and TIA | ||||||
| More Restrictive | N/A | 0.6 | N/A | 1.0 | N/A | 1.3 |
| More Inclusive | N/A | 9.6 | N/A | 11.7 | N/A | 13.1 |