Table 2.

Test Characteristics of ICD-based versus discharge summary-based algorithms for endocarditis cohort identification.

	Positive predictive value 95% confidence interval	Sensitivity 95% confidence interval	Specificity 95% confidence interval
ICD code only	72.4% (443/612) 68.7%, 75.8%	93.4% (155/166) 88.5%, 96.3%	94.1% (112/119) 88.4%, 97.1%
ICD code + ECHO	75.8% (405/534) 72.0%, 79.3%	86.8% (144/166) 80.8%, 91.1%	94.1% (112/119) 88.4%, 97.1%
Discharge Summary	84.5% (327/387) 80.6%, 87.8%	75.9% (126/166) 68.9%, 81.8%	98.3% (117/119) 94.1%, 99.5%
P-value comparing ICD only vs Discharge summary	<0.001	<0.001	0.174
P-value comparing ICD + ECHO vs Discharge summary	.002	.017	.174

ECHO = echocardiogram, ICD = International Classification of Diseases.