Flow chart showing study population.

<p>Out of the 288 persons excluded due to NDD diagnosis within the first year after the TBI, 203 belonged to the moderate-to-severe TBI group, and 85 to the mild TBI group. LOS, length of stay in hospital; NDD, neurodegenerative disease; TBI, traumatic brain injury.</p

Cumulative hazard risk comparison for persons with a history of moderate-to-severe traumatic brain injury versus mild traumatic brain injury (adjusted for age, sex, level of education, and socioeconomic group).

<p>Women shown to the left, and men to the right. The HR shows the increased risk of NDD in persons with a history of moderate-to-severe TBI compared to those with a history of mild TBI for both females and males. HR, hazard ratio; NDD, neurodegenerative disease; TBI, traumatic brain injury.</p

Baseline characteristics of persons hospitalized due to moderate-to-severe and mild traumatic brain injury.

<p>Baseline characteristics of persons hospitalized due to moderate-to-severe and mild traumatic brain injury.</p

Sensitivity and subgroup analyses for incidence and hazard ratios of neurodegenerative disease by sex and age group in persons with moderate-to-severe traumatic brain injury compared to persons with mild traumatic brain injury at baseline.

<p>Sensitivity and subgroup analyses for incidence and hazard ratios of neurodegenerative disease by sex and age group in persons with moderate-to-severe traumatic brain injury compared to persons with mild traumatic brain injury at baseline.</p