Table 2.

Positive and negative predictive values of pharmacy fill data of HCV treatment in the national VA CDW

	Positive predictive value (PPV)	Negative predictive value (NPV)
Overall, % (95% CI)	98.4 (97.3, 99.5)	97.0 (93.7, 100)
By site
Atlanta	100 (100, 100)	100 (100, 100)
Bronx	99.1 (97.3, 100)	100 (100, 100)
DC	98.2 (95.7, 100)	95.0 (85.5, 100)
Houston	98.2 (95.7, 100)	90.0 (76.9, 100)
Los Angeles	96.7 (93.1, 100)	100 (100, 100)
	p=0.60	p=0.51

Abbreviations: HCV - hepatitis C virus; VA - Veterans Health Administration; CDW - Corporate Data Warehouse; CI - confidence interval; DC - Washington, D.C.

Note: Fisher’s Exact tests were used to test for heterogeneity across sites