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695. To identify subgroups of former National Football League (NFL) players using latent profile analysis (LPA) and examine their associations with total years of participation (TYP) and self-reported lifetime sport-related concussion history (SR-CHx). Former NFL players (N=686) aged 50-70 years, with an average 18.0 TYP (±4.5) completed a questionnaire. SR-CHx distributions included low (0-3; n=221); intermediate (4-8; n=209) and high (9+; n=256). LPA measures included Quality of Life in Neurological Disorders Emotional-Behavioral Dysc