The CDC did study defensive gun use in the 1990s. https://www.forbes.com/sites/paulhsieh/2018/04/30/that-time-the-cdc-asked-about-defensive-gun-uses/?sh=5f5bbe

The CDC did study defensive gun use in the 1990s. https://www.forbes.com/sites/paulhsieh/2018/04/30/that-time-the-cdc-asked-about-defensive-gun-uses/?sh=5f5bbed3299a https://www.forbes.com/sites/paulhsieh/2018/04/30/that-time-... The TL;DR is that we don't have reliable data.