Table 3.
Accuracy of the Algorithm Using Data from the Danish National Patient Registry to Identify Cases of Recurrent Intracerebral Hemorrhage When Applying a Blanking Period of Varying Lengtha
| Algorithm Performance in the Danish National Patient Registryb | ||||
|---|---|---|---|---|
| Length of Blanking Period | Positive Predictive Value % (95% CI) | Negative Predictive Value % (95% CI) | Sensitivity % (95% CI) | Specificity % (95% CI) |
| 0 days | 23.0 (19.3–27.1) | 99.0 (98.5–99.3) | 83.1 (75.5–88.6) | 85.6 (84.2–87.0) |
| 7 days | 46.1 (39.6–52.7) | 99.0 (98.5–99.3) | 81.5 (73.7–87.3) | 95.1 (94.2–95.9) |
| 30 days | 67.4 (59.3–74.5) | 98.9 (98.4–99.2) | 78.2 (70.2–84.6) | 98.0 (97.4–98.5) |
| 60 days | 75.4 (66.9–82.3) | 98.5 (98.0–99.0) | 71.8 (63.3–78.9) | 98.8 (98.3–99.2) |
| 90 days | 78.7 (70.1–85.4) | 98.4 (97.8–98.8) | 68.5 (59.9–76.1) | 99.0 (98.6–99.4) |
| 120 daysc | 80.6 (71.7–87.2) | 98.1 (97.5–98.6) | 63.7 (55.0–71.6) | 99.2 (98.8–99.5) |
| 150 days | 82.4 (73.3–88.9) | 98.0 (97.4–98.5) | 60.5 (51.7–68.6) | 99.3 (98.9–99.6) |
| 180 days | 83.5 (74.2–89.9) | 97.8 (97.2–98.3) | 57.3 (48.5–65.6) | 99.4 (99.0–99.7) |
| 360 days | 85.5 (75.3–91.9) | 97.4 (96.6–97.9) | 47.6 (39.0–56.3) | 99.6 (99.2–99.8) |
Notes: aPeriod immediately following the index ICH, during which outcome events are ignored. bInpatient diagnosis, primary coding position. cOptimal algorithm marked in bold.