Frequencies for first 10,000 rows of pregnant variable in namcs2014 dataset :

    Is patient |
     pregnant? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         Blank |      2,682       26.82       26.82
Not applicable |      4,188       41.88       68.70
           Yes |        228        2.28       70.98
            No |      2,902       29.02      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017