Table 4.

Performance of ICD-9 coding algorithms for a prevalent and incident heart failure or cardiomyopathy when compared to chart-review

ALL PATIENTS WITH BRCA	AUTOMATED ICD-9 ALGORITHM HF/CM EVENT
	PREVALENT by Algorithm #2 (with first ICD-9 code occurring BEFORE date of breast cancer diagnosis) N=68 (weighted N=7)	INCIDENT by Algorithm #2 (with first ICD-9 code occurring AFTER date of breast cancer diagnosis) N=56 (weighted N=11)
PREVALENT by gold standard (with first chart mention of HF/CM or LVEF<50% occurring BEFORE date of breast cancer diagnosis) N=61 (weighted N=11)	Sens = 40.0 (16.9–68.9) Spec = 99.4 (97.8–99.8) PPV = 64.5 (27.8–89.6) NPV = 98.3 (96.4–99.2)
INCIDENT by gold standard (with first chart mention of HF/CM or LVEF<50% occurring AFTER date of breast cancer diagnosis) N=46 (weighted N=9)		Sens = 41.7 (16.1–72.7) Spec = 98.1 (96.1–99.0) PPV = 33.3 (12.8–63.1) NPV = 98.6 (96.8–99.4)