Frequencies for first 10,000 rows of ivfluids variable in nhamcsed2008 dataset :

  iv fluids |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      7,259       72.59       72.59
        yes |      2,741       27.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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