Frequencies for first 10,000 rows of painscale variable in nhamcsed2012 dataset :

 Pain scale |
     (0-10) |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |        553        5.53        5.53
    Unknown |      1,908       19.08       24.61
          0 |      2,331       23.31       47.92
          1 |        112        1.12       49.04
          2 |        294        2.94       51.98
          3 |        289        2.89       54.87
          4 |        464        4.64       59.51
          5 |        656        6.56       66.07
          6 |        538        5.38       71.45
          7 |        647        6.47       77.92
          8 |        822        8.22       86.14
          9 |        482        4.82       90.96
         10 |        904        9.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016