Table 1.

Performance of the Congestive Heart Failure Information Extraction Framework (CHIEF) system for each patient compared to the reference standard established by human review (patient-level classification CHI19).

Patient-Level Classification	Sensitivity Estimate % (95% CI)	Positive Predictive Value Estimate % (95% CI)	F-measure
Measure CHI19a met	98.9 (97.8, 99.5)	98.7 (97.6, 99.4)	98.8
Left Ventricular Systolic Function assessed	100.0 (99.5, 100.0)	99.0 (98.0, 99.6)	99.5
EFb <40%	96.8 (94.6, 98.3)	95.1 (92.6, 97.0)	96.0
ACEIc or ARBd	99.2 (98.1, 99.7)	88.5 (85.8, 90.8)	93.5
Reason not on medications	26.9 (20.0, 34.9)	90.7 (77.9, 97.4)	41.5

^aCHI19: Congestive Heart Failure Inpatient Measure 19; LVEF >40 on ACEI/ARB at discharge.

^bEF: ejection fraction.

^cACEI: angiotensin-converting enzyme inhibitor.

^dARB: angiotensin-receptor blocker.