Frequencies for first 10,000 rows of pain variable in nhamcsed2000 dataset :

 presenting |
   level of |
       pain |      Freq.     Percent        Cum.
------------+-----------------------------------
    Unknown |      5,140       51.40       51.40
       None |      1,200       12.00       63.40
       Mild |      1,647       16.47       79.87
   Moderate |      1,360       13.60       93.47
     Severe |        454        4.54       98.01
      Blank |        199        1.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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