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, Hospital fixed effects have been estimated but are not shown for presentational reasons log likelihood-29690,63-11295, p.2

, Standard errors in brackets * significant at 10%

, ** significant at

, *** significant at 1% (b): Likelihood ratio test of theta=0: chibar2(01) = 3.6e-05 Prob>=chibar2 = 0.498 PMSI Database: 28,410 stays and 287 hospitals, 1997.

, ** significant at

*. , , p.1

, PMSI Database: 28,410 stays and 287 hospitals, 1997.

, ** significant at

*. , 1% PMSI Database: 28,410 stays and 287 hospitals, 1997.