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Table 2 Sensitivity, specificity, positive and negative predictive values of unlinked data in identifying incident fall-related hip fractures

From: Linked versus unlinked hospital discharge data on hip fractures for estimating incidence and comorbidity profiles

  Linked data Unlinked data Unlinked data Unlinked data Unlinked data Unlinked data
  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)
  1. Note values are percentages (95% confidence intervals) unless stated otherwise. True negatives were community-dwelling Victorian population aged 65+ years hospitalised for fall-related injury other than a hip fracture between 2005/06 and 2007/08.
  2. NA – Not applicable. PPV – Positive predictive value. NPV – Negative predictive value. CI – confidence intervals.