Table 2.

Performance of Classification Based on Claims Codes for Breast Imaging or Biopsy/FNA within Ninety Days or Classification and Regression Tree Analysis for Classifying Screening Mammograms as Normal versus Abnormal Assessed in Validation Half-Sample (N = 193,855)

	Claims Codes for Breast Imaging or Biopsy	CART
Performance Measures	Estimate (95% CI)	Estimate (95% CI)
Sensitivity	74.9 (74.1, 75.6)	82.5 (81.9, 83.2)
Specificity	99.4 (99.4, 99.5)	96.6 (96.6, 96.7)
PPV	90.9 (90.4, 91.5)	65.3 (64.6, 66.0)
NPV	98.1 (98.0, 98.2)	98.6 (98.6, 98.7)

CART, classification and regression tree; CI, confidence interval; NPV, negative predictive value; PPV, positive predictive value.