Frequencies for first 10,000 rows of proc22d variable in nhamcsed1993 dataset :

      other |
  procedure |
     #2 - 2 |
      digit |      Freq.     Percent        Cum.
------------+-----------------------------------
         00 |      9,917       99.17       99.17
         75 |          6        0.06       99.23
         89 |         44        0.44       99.67
         90 |          8        0.08       99.75
         91 |          5        0.05       99.80
         93 |          3        0.03       99.83
         94 |          1        0.01       99.84
         96 |          1        0.01       99.85
         97 |          1        0.01       99.86
         99 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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