Frequencies for first 10,000 rows of otherbld variable in nhamcsed1998 dataset :

other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,685       76.85       76.85
          1 |      2,315       23.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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