Frequencies for first 10,000 rows of intent variable in nhamcsed2006 dataset :

            intentionality of injury |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                yes (self-inflicted) |        154        1.54        1.54
                       yes (assault) |        159        1.59        3.13
                   no, unintentional |      2,658       26.58       29.71
                             unknown |        582        5.82       35.53
not applicable (not an injury visit) |      6,447       64.47      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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