Another study from the same period, the National Crime Victimization Survey (NCVS), estimated 65,000 DGUs (Defensive gun use) annually. The NCVS survey differed from Kleck's study in that it only interviewed those who reported a threatened, attempted, or completed victimization for one of six crimes: rape, robbery, assault, burglary, non-business larceny, and motor vehicle theft. A National Research Council report said that Kleck's estimates appeared to be exaggerated and that it was almost certain that "some of what respondents designate as their own self-defense would be construed as aggression by others".