Frequencies for first 10,000 rows of ager variable in nhamcsed1997 dataset :

      patient age |
           recode |      Freq.     Percent        Cum.
------------------+-----------------------------------
   Under 15 years |      2,149       21.49       21.49
      15-24 years |      1,433       14.33       35.82
      25-44 years |      3,307       33.07       68.89
      45-64 years |      1,738       17.38       86.27
      65-74 years |        586        5.86       92.13
75 years and over |        787        7.87      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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