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## Table 5. Sensitivity Analyses: Tobit Models of Continuous PSIs

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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