Frequencies for iqi_91_conds_low_est variable in vwhqi_hosp_ahrq dataset :

IQI_91_CONDS_ |
      LOW_EST |      Freq.     Percent        Cum.
--------------+-----------------------------------
Not Available |      4,594      100.00      100.00
--------------+-----------------------------------
        Total |      4,594      100.00

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