Frequencies for first 10,000 rows of bac variable in nhamcsed2011 dataset :

 BAC (Blood |
   alcohol) |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,674       96.74       96.74
        Yes |        326        3.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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