Frequencies for first 10,000 rows of otherbld variable in nhamcsed1996 dataset :

other blood |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,343       73.43       73.43
          1 |      2,657       26.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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