Frequencies for first 10,000 rows of ager variable in nhamcsed1998 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      2,128       21.28       21.28
      15-24 years |      1,494       14.94       36.22
      25-44 years |      3,322       33.22       69.44
      45-64 years |      1,713       17.13       86.57
      65-74 years |        583        5.83       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