Table 1.
Code Validation for Cerebral Venous Thrombosis.
| Total number of Patients | CVT | No CVT | Positive Predictive Value (95% CI) | Sensitivity (95% CI) | Specificity (95% CI) | |
|---|---|---|---|---|---|---|
| ICD-9 codes 325.0, 437.6, and 671.5 in any position | 111 | 84 | 27 | 75.7 (66.9-82.8) | 77.8 (69.0-84.6) | 92.7 (89.5-94.9) |
| ICD-9 codes 325.0, 437.6, and 671.5 in primary position | 37 | 31 | 6 | 83.8 (68.5-92.7) | 28.7 (21.0-37.9) | 98.3 (96.2-99.3) |
| ICD-9 code 325.0 in any position | 87 | 76 | 11 | 87.4 (78.6-93.0) | 70.4 (66.7-83.4) | 96.9 (94.4-98.3) |
| ICD-9 code 325.0 in primary position | 30 | 28 | 2 | 93.3 (77.6-99.2) | 25.9 (18.6-35.0) | 99.4 (97.8-100.0) |
| ICD-9 code 437.6 in any position | 24 | 8 | 16 | 33.3 (17.8-53.4) | 7.4 (3.6-14.1) | 95.5 (92.8-97.3) |
| ICD-9 code 437.6 in primary position | 7 | 3 | 4 | 42.9 (15.8-75.0) | 2.8 (0.6-8.2) | 98.8 (97.0-99.7) |
Abbreviations: CI, confidence interval; CVT, cerebral venous thrombosis; ICD-9, International Classification of Diseases, Ninth Revision.