Frequencies for first 10,000 rows of ager variable in namcs1997 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      1,686       16.86       16.86
      15-24 years |        705        7.05       23.91
      25-44 years |      2,230       22.30       46.21
      45-64 years |      2,584       25.84       72.05
      65-74 years |      1,423       14.23       86.28
75 years and over |      1,372       13.72      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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