Table 7. Performance of EMR-based CDA that target influenza-like illness.

		CDA Number
Category	Subcategory	17	18	19	20	21	22
CDA Component	(VA ICD-9 Codes	•		•		•	•
	Text-Only; OR Text)		•		•	•
	AND Text						•
	AND Temperature >37.8°C			•	•	•	•
Performance	Sensitivity	79	92	75	92	100	71
	Specificity	95.5	91	99.8	99.7	99.7	99.9
	Positive Predictive Value	2.7	2	36.7	34	34	68
	Area under the ROC	87	91	87	96	100	85

Composition (black dot indicates that the component is included in the CDA) of ILI CDAs that combine parameters derived from structured and free-text EMR entries. Statistical performance was combined for both study sites.