Frequencies for psi_12_postop_pulmemb_dvtstr variable in vwhqi_hosp_ahrq dataset :

           PSI_12_POSTOP_PULMEMB_DVT |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                                     |        159        3.29        3.29
      Better than U.S. National Rate |        219        4.53        7.83
No Different than U.S. National Rate |      2,649       54.84       62.67
                       Not Available |      1,482       30.68       93.35
           Number of Cases Too Small |         94        1.95       95.30
       Worse than U.S. National Rate |        227        4.70      100.00
-------------------------------------+-----------------------------------
                               Total |      4,830      100.00

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