A Survey Not Designed to Measure Defensive Gun Use Finds Little of It

A Survey Not Designed to Measure Defensive Gun Use Finds Little of It - Hit & Run : Reason.com
A study in the latest issue of Preventive Medicine estimates that less than 1 percent of crime victims use guns in self-defense. 
The authors, Harvard health policy professor David Hemenway and University of Vermont economist Sara Solnick, find that using a gun seems to be effective at reducing property loss but "is not associated with a reduced risk of victim injury."
It will surprise no one familiar with the long-running debate about defensive gun use (DGU) that the source of the data for this study is the National Crime Victimization Survey (NCVS), which consistently generates much lower DGU estimates than other surveys do. 
At least some of that gap can be plausibly explained by weaknesses in the NCVS that Hemenway and Solnick do not seriously address or, for the most part, even mention.
...They do mention that the survey includes "no specific questions about self-defense gun use."
That's a pretty big flaw for a study aimed at measuring self-defense gun use, which the NCVS isn't.