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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).