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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

Text Description is below the image.

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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