Frequencies for first 10,000 rows of obgyn variable in nhamcsed1997 dataset :

ob/gyn care |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,784       97.84       97.84
          1 |        216        2.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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