Frequencies for first 10,000 rows of sex variable in nhamcsed2013 dataset :

Patient sex |      Freq.     Percent        Cum.
------------+-----------------------------------
     Female |      5,385       53.85       53.85
       Male |      4,615       46.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016