Survey Question Wording Effects on Self-Reported Traumatic Brain Injury Prevalence in US Adults
A randomized survey of 4,303 US adults compared two question formats for assessing 12-month TBI history: grouped versus individual symptom checklists. Individually listed TBI symptoms yielded significantly higher self-reported prevalence (8.3%) than grouped symptoms (4.3%), highlighting how survey methodology substantially influences TBI burden estimates in population surveillance.