Frequencies for first 10,000 rows of icu_srvc_cd variable in pos2003 dataset :

       srv: |
  intensive |
  care unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |        438        4.38       92.27
          1 |        731        7.31       99.58
          2 |         36        0.36       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017