Frequencies for first 10,000 rows of consuba1 variable in nhamcsed2001 dataset :

 controlled |
  substance |
   code for |
    adverse |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         24        0.24        0.24
          2 |         50        0.50        0.74
          3 |          1        0.01        0.75
          4 |         10        0.10        0.85
          6 |        224        2.24        3.09
          7 |         37        0.37        3.46
          . |      9,654       96.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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