Table 5.

Regression analysis for the two part model of log costs: Regression coefficients and t statistics

	Adults and children combined	p	Adults	p	Child	p
Comorbidity	0.13	<.01	0.13	<.01	0.15	<.01
	(16.66)		(14.89)		(6.68)
Age	0.00286	<.01	0.00059		-0.00466
	(5.62)		(0.52)		(1.76)
Female	0.00		0.04		-0.05
	(0.00)		(1.22)		(1.91)
Mental illness	0.19		0.16		0.32
	(4.19)	<.01	(3.09)	<.01	(2.98)	<.01
Addiction	0.15		0.13		0.42
	(2.46)	<.05	(1.91)		(2.13)	<.05
Pregnancy	1.02		0.95		1.48
	(17.28)	<.01	(14.49)	<.01	(4.93)	<.01
Intercept	2.23		2.33		2.29
	(120.44)	<.01	(40.47)	<.01	(83.58)	<.01
R 2	0.21		0.20		0.06
N	3,427		1,881		1,546

Observed log10 Total Cost regression coefficients from a two part regression model (equations (1) and (2) in the Appendix). The coefficients for the zero inflation part of the two part model are not displayed. T-statistics are in parentheses.