Frequencies for first 10,000 rows of alcohol variable in linkco1991us_num dataset :

Alcohol Use |
     During |
  Pregnancy |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        237        2.37        2.37
          2 |      5,142       51.42       53.79
          9 |      4,621       46.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015