#RegretRate for various surgeries: * Knee surgery: 22% total regret, 2.9% even without complications http://doi.org/10.1186/s12891-020-3041-y * Back surgery: 21% in older adults http://doi.org/10.1097/BRS.0000000000004287 * Regret of having children: varies by study, but usually in the 10-20% range http://doi.org/10.1371/journal.pone.0254163 * Breast reconstruction after a mastectomy: 19.5% moderate to strong regret http://doi.org/10.1080/14768320601124899 * #GenderAffirmationSurgery: < 1% http://doi.org/10.1097/GOX.0000000000003477 #trans