HealthDay News — Concussion is associated with an increased risk for diagnosis of attention-deficit/hyperactivity disorder (ADHD), mood and anxiety disorders (MADs), dementia, and Parkinson disease, according to a study published online July 27 in Family Medicine and Community Health.

Marc P. Morissette, from the Pan Am Clinic Foundation in Winnipeg, Manitoba, Canada, and colleagues conducted a retrospective population-based cohort study using administrative health data for Manitoba between 1990 to 1991 and 2014 to 2015. Data were included for 47,483 individuals diagnosed with a concussion, who were matched with controls based on age, sex, and geographical location in a 3:1 ratio.

The cohort included 28,021 men and 19,462 women with concussion, matched with 81,871 men and 57,159 women. The researchers found that concussion correlated with an increased risk for ADHD, MADs, dementia, and Parkinson disease (adjusted hazard ratios, 1.39, 1.72, 1.72, and 1.57, respectively).

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“Future studies could expand on our findings by including chart reviews to confirm clinical diagnoses of concussion, adjusting for familiality of conditions of interest, and long-term prospective follow-up of individuals following incident concussion,” the authors write.

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