Table 2 Sensitivity, specificity, positive and negative predictive values of unlinked data in identifying incident fall-related hip fractures
| Â | Linked data | Unlinked data | Unlinked data | Unlinked data | Unlinked data | Unlinked data |
|---|---|---|---|---|---|---|
| Â | Ref standard | Base case | Scenario 1 | Scenario 2 | Scenario 3 | Scenario 4 |
No hip fractures | N=10,110 | N=11,110 | N=11,746 | N=11,056 | N=10,173 | N=10,765 |
Overestimation | NA | 9.9% | 16.2% | 9.4% | 0.6% | 6.5% |
Sensitivity |  | 94.4% (94.0–94.9) | 99.8% (99.7–99.9) | 94.4% (93.9–94.8) | 94.4% (93.9–94.8) | 99.7% (99.6–99.8) |
Specificity |  | 97.5% (97.4–97.6) | 97.4% (97.2–97.5) | 97.6% (97.5–97.7) | 99.0% (98.9–99.1) | 98.9% (98.8–99.0) |
PPV |  | 85.9% (85.3–86.6) | 85.9% (85.2–86.5) | 86.3% (85.7–87.0) | 93.8% (93.3–94.3) | 93.7% (93.2–94.1) |
NPV |  | 99.1% (99.0–99.2) | 100.0% (99.9–100.0) | 99.0% (99.0–99.2) | 99.1% (99.0–99.2) | 100.0% (99.9–100.0) |