Frequencies for first 10,000 rows of obgyn variable in nhamcsed2004 dataset :

ob/gyn care |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,772       97.72       97.72
        yes |        228        2.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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