Frequencies for first 10,000 rows of reason variable in nhamcsed1992 dataset :

    Major reason for |
          this visit |      Freq.     Percent        Cum.
---------------------+-----------------------------------
 Injury, first visit |      2,949       29.49       29.49
   Injury, follow-up |        253        2.53       32.02
Illness, first visit |      5,587       55.87       87.89
  Illness, follow-up |        333        3.33       91.22
        Other reason |        676        6.76       97.98
    Blank or invalid |        202        2.02      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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