Frequencies for psi_11_postop_respfail variable in vwhqi_hosp_ahrq dataset :

              PSI_11_POSTOP_RESPFAIL |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
      Better than U.S. National Rate |        182        4.03        4.03
No Different than U.S. National Rate |      2,389       52.87       56.89
                       Not Available |      1,466       32.44       89.33
           Number of Cases Too Small |        229        5.07       94.40
       Worse than U.S. National Rate |        253        5.60      100.00
-------------------------------------+-----------------------------------
                               Total |      4,519      100.00

by Jean Roth , jroth@nber.org , 16 Nov 2016