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 |        201        4.38        4.38
No Different than U.S. National Rate |      2,396       52.15       56.53
                       Not Available |      1,540       33.52       90.05
           Number of Cases Too Small |        206        4.48       94.54
       Worse than U.S. National Rate |        251        5.46      100.00
-------------------------------------+-----------------------------------
                               Total |      4,594      100.00

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