Table 1.

Participant demographics: Four ex-football players who played American football for 11 to 16 years

ID	Age at Entry (y) Race	Education (y) Highest Degree	Age First Exposure (y) Organized Football	Total years Played Football	Total years Played Pro-Football	Primary Position Played	Chief Complaints at Entry
P1	65 Caucasian/White	20 PhD, in Exercise Physiology after football	10 Pop Warner	14	1.5 CFL	Middle Linebacker, Defense	Emotional outbursts, depression, cognitive problems, poor memory, poor sleep
P2	55 Caucasian/White	16 BA	7 Pop Warner	15	0 Pop Warner, High School, College, only	Tackle, Offensive Lineman	Emotional outbursts, cognitive problems, poor memory
P3	57 African American/Black	16 BA	14 High School	16	8 NFL	Cornerback, Defense Position	Emotional outbursts, depression, cognitive problems, poor memory, poor sleep; chronic pain (15 surgeries during NFL); tinnitus
P4	74 Caucasian/White	17 BS, Engineering	13	11	4 NFL	Defensive End, and Offensive Lineman, all positions	Emotional outbursts, cognitive problems, chronic pain (4 hip replacements, 3 shoulder surgeries; 2 knee surgeries; 3 wrist/hand surgeries; 2 biceps surgeries)

NFL, National Football League; CFL, Canadian Football League.