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Table 2 Agreement between claims algorithm and SEER data for identification of partial versus radical nephrectomy

From: External validation of a claims-based algorithm for classifying kidney-cancer surgeries

  

PROCEDURE BASED ON MEDICARE CLAIMS

 
  

Partial Nephrectomy

Radical Nephrectomy

Total

PROCEDURE BASED ON SEER CANCER-DIRECTED SURGERY VARIABLE

Partial Nephrectomy

495

86

581

 

Radical Nephrectomy

88

4720

4808

 

Total

583

4806

5389

Observed agreement = 96.8%

Kappa = 0.83 (0.81–0.86)

Sensitivity = 85.2% (82.0%–88.0%)

Specificity = 98.2% (97.7%–98.5%)

Positive Predictive Value = 84.9% (81.7%–87.7%)

Negative Predictive Value = 98.2% (98.0%–98.6%)

  1. † Calculations are for identification of partial nephrectomies based on SEER cancer-directed surgery variable as the reference-standard