Frequencies for first 10,000 rows of pain variable in nhamcsed2007 dataset :

 presenting |
   level of |
       pain |      Freq.     Percent        Cum.
------------+-----------------------------------
  blank'    |        267        2.67        2.67
    unknown |      1,778       17.78       20.45
       none |      2,098       20.98       41.43
       mild |      1,338       13.38       54.81
   moderate |      2,459       24.59       79.40
     severe |      2,060       20.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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