TABLE 3.

Regression Results: Length of Stay and Routine Discharge Outcomes

Variable	Length of stay (days), gamma-log regression* (N=5,584,284)		Routine discharge, logistic regression (N=5,580,053)
	Exp(β)	95% CI	OR	95% CI
FCI (continuous comorbidity count)	1.089	1.088 to 1.089	0.815	0.813 to 0.816
ICD-10-CM lexicon (base: ICD-9-CM)	1.003	0.999 to 1.007	0.977	0.970 to 0.985
Interaction term: FCI × ICD lexicon	0.995	0.994 to 0.997	1.013	1.011 to 1.016
Female (base: male)	0.843	0.841 to 0.845	1.082	1.078 to 1.087
Age (base: 18–24)
25–34	0.947	0.941 to 0.953	1.043	1.029 to 1.058
35–44	1.048	1.041 to 1.055	0.669	0.660 to 0.679
45–54	1.150	1.143 to 1.157	0.396	0.391 to 0.401
55–64	1.187	1.180 to 1.194	0.270	0.267 to 0.274
65–74	1.185	1.178 to 1.192	0.180	0.178 to 0.183
75–84	1.213	1.206 to 1.220	0.109	0.108 to 0.111
85+	1.204	1.197 to 1.211	0.054	0.054 to 0.055
State (base: Arizona)
Colorado	0.928	0.923 to 0.933	0.815	0.808 to 0.823
Michigan	0.934	0.931 to 0.938	0.739	0.733 to 0.744
New Jersey	1.067	1.062 to 1.071	0.746	0.740 to 0.752
New York	1.192	1.187 to 1.196	0.668	0.663 to 0.673
Utah	0.881	0.873 to 0.889	0.682	0.673 to 0.691
Washington	0.940	0.935 to 0.945	1.157	1.146 to 1.167
Intercept	3.991	3.966 to 4.015	14.00	13.81 to 14.19

^*Generalized linear model with gamma family and log link.

P-values were uniformly P<0.001, with the exception of the P-value for ICD-10-CM lexicon in the length of stay model (P=0.21).

CI indicates confidence interval; Exp(β), exponentiated coefficient; FCI, Functional Comorbidity Index; ICD, International Classification of Diseases; OR, odds ratio.