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Slide Presentation from the AHRQ 2007 Annual Conference

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Table 5. Sensitivity Analyses: Tobit Models of Continuous PSIs

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Models	Critical access hospital (CAH)	PSI-5	PSI-6	PSI-7	PSI-15	Composite score of 4 PSIs
Random-effects Tobit model of risk-adjusted rate PSI indicators (89 hospitals, 1997 to 2004)∏	CAH	-0.91	-2.00**	-2.91**	-1.61*	-1.00*‡
	CAHmv	-0.54	-2.10**	-4.34**	-2.04	-1.29*‡
Random-effects Tobit model of observed rate of PSI indicators (89 hospitals, 1997 to 2004)†	CAH	-0.91	-1.39**	-2.45**	-0.85*‡	-0.53*‡
	CAHmv	-0.54	-1.48*	-3.65**	-1.18*‡	-0.73*‡
Unconditional fixed-effects Tobit models (89 hospitals, 1997 to 2004)+++	CAH	NA++	-0.91	-2.02**	-1.63*	-0.96*
	CAHmv	NA++	-0.70	-3.21**	-2.41*	-1.46*

* Statistically significant at 0.1 level.
** Statistically significant at 0.05 level.
++ Convergence was not achieved.
+++ Ad hospital dummy variables in cross-sectional Tobit model.
‡ The results should be interpreted with caution, given that estimations ofr some coefficients were not stable under quadchk.
∏ PSI-5 are observed rate.

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