Frequencies for first 10,000 rows of pain variable in nhamcsed2004 dataset :

presenting level |
         of pain |      Freq.     Percent        Cum.
-----------------+-----------------------------------
no box is marked |        513        5.13        5.13
         unknown |      2,181       21.81       26.94
            none |      1,671       16.71       43.65
            mild |      1,741       17.41       61.06
        moderate |      2,428       24.28       85.34
          severe |      1,466       14.66      100.00
-----------------+-----------------------------------
           Total |     10,000      100.00

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