Frequencies for first 10,000 rows of major variable in namcs2009 dataset :

              major reason for visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                               blank |        173        1.73        1.73
new problem (less than 3 mos. onset) |      4,318       43.18       44.91
            chronic problem, routine |      2,555       25.55       70.46
           chronic problem, flare-up |        716        7.16       77.62
                   pre-/post-surgery |        170        1.70       79.32
                     preventive care |      2,068       20.68      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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