Table 2.

Multivariate Analysis for Changes in Case Mix Index (CMI) Over Time

		Adjusted differences between the means (P value)
	Unadjusted change in mean CMI 1996 vs. 2009 (P value)	Overall	Public only	Private only
Private vs. public	0.15 vs. 0.07 (0.0003)*	0.09 (<0.0001)*
Teaching vs. not	0.16 vs. 0.12 (0.10)	0.03 (0.30)	0.02 (0.66)	0.03 (0.38)
Trauma 1 vs. not	0.21 vs. 0.13 (0.09)	0.09 (0.11)	0.04 (0.41)	0.11 (0.19)
Increasing # of beds	0.013/100 beds (0.03)*	0.00003 (0.65)	0.0001 (0.26)	0.00001 (0.87)

^*P<0.05.