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Table 2 Estimating Population-Level Stroke/TIAs Diagnoses

From: Increasing false positive diagnoses may lead to overestimation of stroke incidence, particularly in the young: a cross-sectional study

Age Group Year Neuro RFVs
(Thousands)
Stroke/TIA
Prevalence (%)
True Positive
Stroke/TIAs a (Thousands)
False Positive
Stroke/TIAs b (Thousands)
Total
Stroke/TIA Diagnoses (Thousands)
Young 1995 3300 1.0% 33 33 66
2015 5300 0.6% 32 53 84
Change    −3% 61% 27%
Older Adults 1995 2000 18% 360 16 376
2015 3000 9% 270 27 297
Change    −25% 69% −21%
  1. aTrue Positives = Number of Neuro RFVs x Stroke/TIA Prevalence
  2. bFalse Positives = Number of Neuro RFVs x (1 - Specificity) x (1 - Stroke/TIA Prevalence)
  3. Specificity of Stroke/TIA diagnosis = 99%