Frequencies for first 10,000 rows of pain variable in nhamcsed2003 dataset :

presenting level |
         of pain |      Freq.     Percent        Cum.
-----------------+-----------------------------------
no box is marked |        382        3.82        3.82
         unknown |      3,271       32.71       36.53
            none |      1,613       16.13       52.66
            mild |      1,442       14.42       67.08
        moderate |      1,952       19.52       86.60
          severe |      1,340       13.40      100.00
-----------------+-----------------------------------
           Total |     10,000      100.00

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