Frequencies for first 10,000 rows of contsub5 variable in nhamcsed2013 dataset :

      Controlled substance |
 status code medication #5 |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
               Schedule II |        109        1.09        1.09
              Schedule III |         47        0.47        1.56
               Schedule IV |         42        0.42        1.98
                Schedule V |          1        0.01        1.99
                No control |        985        9.85       11.84
              Undetermined |         11        0.11       11.95
        Multiple schedules |         10        0.10       12.05
                         . |      8,795       87.95      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016