Table 1.

Risk factors associated with chronic traumatic encephalopathy.

(i) Head trauma: single or repetitive
(ii) History of head concussion
(iii) Participation in the following
Boxing
American football: offensive/defensive   linemen/linebackers/running backs
Soccer
Professional wrestling
Hockey
Military service: blast injuries
(iv) Length of sport participation
(v) Epileptics
(vi) Victims of domestic abuse
(vii) Age of injuries: younger ages and older ages
(viii) Genetic variation: ApoE3 or ApoE4