Frequencies for first 10,000 rows of admitccu variable in nhamcsed1999 dataset :

admitted to |
    icu/ccu |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,851       98.51       98.51
          1 |        149        1.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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