Paper: "Estimating intruder-related firearm retrievals in U.S. households, 1994." By Robin M. Ikeda and others. Violence and Victims, Winter 1997. Estimating intruder-related firearm retrievals... [Violence Vict. 1997] - PubMed - NCBI
To estimate the frequency of firearm retrieval because of a known or presumed intruder, the authors analyzed data from a 1994 national random digit dialing telephone survey (n = 5,238 interviews). ... National projections based on these self-reports reveal an estimated 1,896,842 (95% CI [confidence interval] = 1,480,647-2,313,035) incidents in which a firearm was retrieved, but no intruder was seen; 503,481 (95% CI = 305,093-701,870) incidents occurred in which an intruder was seen, and 497,646 (95% CI = 266,060-729,231) incidents occurred in which the intruder was seen and reportedly scared away by the firearm.