Frequencies for psi_90_safety variable in vwhqi_hosp_ahrq dataset :

                       PSI_90_SAFETY |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
      Better than U.S. National Rate |        156        3.40        3.40
No Different than U.S. National Rate |      2,964       64.52       67.91
                       Not Available |      1,262       27.47       95.39
       Worse than U.S. National Rate |        212        4.61      100.00
-------------------------------------+-----------------------------------
                               Total |      4,594      100.00

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