Frequencies for first 10,000 rows of ager variable in nhamcsed1996 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      2,135       21.35       21.35
      15-24 years |      1,492       14.92       36.27
      25-44 years |      3,363       33.63       69.90
      45-64 years |      1,613       16.13       86.03
      65-74 years |        637        6.37       92.40
75 years and over |        760        7.60      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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