Table 2. Sensitivities and predictive values for subsequent hospital use of the WMI and CRMs.

Method	WMI ≥ 2	Medicare CRM	WMI ≥ 3	Proprietary CRM
Proportion of all patients designated “at-risk”	0.53	0.52	0.30	0.30
Sensitivity of method for emergency use	0.62	0.56	0.38	0.35
Sensitivity of method for hospital use	0.69	0.64	0.45	0.43
Positive predictive value* for emergency use	0.58	0.54	0.63	0.58
Positive predictive value* for hospital use	0.26	0.25	0.30	0.28

* Positive Predictive Value: The proportion of patients designated by the method as “at-risk for emergency or hospital use” who actually used such care in the year following the assessment.