It is NOT a study from the CDC. Please, cite the CDC study. Because let me tell you what the CDC says on the matter, taken directly from their wesbite:
Although definitions of defensive gun use vary, it is generally defined as the use of a firearm to protect and defend oneself, family, other people, and/or property against crime or victimization.
Estimates of defensive gun use vary depending on the questions asked, populations studied, timeframe, and other factors related to study design. Given the wide variability in estimates, additional research is necessary to understand defensive gun use prevalence, frequency, circumstances, and outcomes.