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Table 4 Validation of diagnostic codes for stroke

From: Validation of diagnostic codes of major clinical outcomes in a National Health Insurance database

Ischemic strokeTotalTrueFalsePPV (%)Sensitivity (%)Specificity (%)
Hospitalization + primary diagnostic code200 (100)181 (90.5)19 (9.5)90.5
Hospitalization + primary diagnostic code + imaging diagnosisa179 (100)165 (92.2)14 (7.8)92.291.226.3
Hospitalization + primary diagnostic code + prescriptionb181 (100)169 (93.4)12 (6.6)93.493.436.8
Hospitalization (over 3 days) + primary diagnostic code + imaging diagnosis170 (100)157 (92.4)13 (7.6)92.486.731.6
Hospitalization (over 3 days) + primary diagnostic code + prescription173 (100)163 (94.2)10 (5.8)94.290.147.4
  1. PPV positive predictive value
  2. aBrain imaging studies including a computed tomography (CT) scan or a magnetic resonance imaging (MRI)
  3. bAt least ≥ 1 prescription of antithrombotic agents at discharge