Frequencies for first 10,000 rows of injpoisad variable in nhamcsed2014 dataset :

  Is visit related to injury, poisoning |
           or adverse effect of medical |
                          treatment?  U |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                  Blank |          6        0.06        0.06
                                Unknown |        662        6.62        6.68
                     Yes, injury/trauma |      3,148       31.48       38.16
                         Yes, poisoning |         84        0.84       39.00
Yes, adverse effect of medical treatmen |        205        2.05       41.05
No, visit is not related to injury, poi |      5,881       58.81       99.86
             Questionable injury status |         14        0.14      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017