Skip to main content

Table 3 2 × 2 table depicting results for Algorithm Ba, optimal for use when medical record review is not possiblea

From: Administrative Algorithms to identify Avascular necrosis of bone among patients undergoing upper or lower extremity magnetic resonance imaging: a validation study

  MRI Result (Gold standard)  
Algorithm B   AVN (+) AVN (−) Total
Algorithm (+) for AVN 48 11 59
Algorithm (−) for AVN 35 8106 8141
Total 83 8117 8200
  1. aAlgorithm B: Defined as ≥2 ICD-9 codes for AVN at least 7 days apart within 6 months of MRI; Sensitivity = 57.8% (95% CI 46.5–68.6), PPV = 81.4% (95% CI 69.1–90.3).