A firearm-related injury is defined as a penetrating injury or gunshot wound from a weapon using a powder charge to fire a projectile.
NEISS does not use ICD codes. However, reporters are given extensive training and report any gun-related injury cases in the emergency department record. Victims may also have other types of injuries, but if the incident involved a gun, it is included. Coders also attempt to capture data on intent, when appropriate information is provided in the medical record.
Data by race are not reported because multiple race data are not typically available from the emergency department records.
In 2013, rates for 2007-2009 were revised using intercensal population estimates based on the 2000 and 2010 censuses instead of the postcensal estimates for the denominator. However, the baseline estimate for the total population did not change so the target remained the same. Some population subgroups estimates were revised.