Table 4.

Individual hospitals ability to accurately capture super-utilizers. C-statistics with 95% Confidence interval based on an individual patient’s maximum use at a single hospital

	One Hospital	2 or More Hospitals	Total
3 or more encounters	0.968 (0.967 to 0.968)	0.746 (0.745 to 0.749)	0.911 (0.910 to 0.912)
4 or more encounters	1.0 (Reference)	0.681 (0.679 to 0.682)	0.814 (0.813 to 0.815)
Length of Stay > 95 percentile	0.875 (0.874 to 0.877)	0.737 (0.735 to 0.738)	0.820 (0.819 to 0.821)
Yearly Cost > 95 percentile	0.788 (0.786 to 0.790)	0.667 (0.666 to 0.669)	0.738 (0.737 to 0.739)