Frequencies for first 10,000 rows of major variable in namcs2011 dataset :

              Major reason for visit |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                               Blank |        154        1.54        1.54
New problem (less than 3 mos. onset) |      4,009       40.09       41.63
            Chronic problem, routine |      2,302       23.02       64.65
           Chronic problem, flare-up |        811        8.11       72.76
                   Pre-/Post-surgery |        508        5.08       77.84
                     Preventive care |      2,216       22.16      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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