Frequencies for first 10,000 rows of pain variable in nhamcsed2005 dataset :

 presenting |
   level of |
       pain |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |        423        4.23        4.23
       none |      1,816       18.16       22.39
       mild |      1,531       15.31       37.70
   moderate |      2,396       23.96       61.66
     severe |      1,729       17.29       78.95
    unknown |      2,105       21.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016