Table 8.

The best multisite phenotyping feature sets and their overall performance characteristics. The multisite phenotypes were derived from Table 7 by selecting components of phenotypes that appeared at multiple sites.

Phenotyping Feature Set	Description	Sensitivity, specificity
Other Viral Pneumonia OR Acute Respiratory Failure with Hypoxia OR Shortness of Breath OR Abnormal Lung Finding	Retrospective phenotype: Diagnoses mentioned in top feature sets at >1 site	Site A: 0.79,0.72 Site B: 0.88, 0.85 Site C: 0.69,0.90b Site D: 0.64,0.58
CRPa AND Ferritin	Real-time phenotype: Laboratory tests mentioned in top feature sets at all 4 sites	Site A: 0.76,0.85 Site B: 0.88, 0.85 Site C: 0.42, 0.98 Site D: 0.66, 0.55
Remdesivir OR Oxygen (severe) OR Dx of Other Viral Pneumonia	Retrospective phenotype: All items mentioned at multiple sites in OR feature sets	Site A: 0.74,0.91b Site B: 0.81, 0.94b Site C: 0.60,0.92 Site D: 0.61,0.71b

^aCRP: C-reactive protein.

^bThe top-performing phenotype at each site is italicized.