Table 1.

Subject Demographics of Athletes with Concussion and Matched Controls

Concussed								Controls
Subject	Sex	Age	Sport	#Previous concussions	NP normal	Symptom free	Return to play	Sex	Age	Sport
1	F	19	Field hockey	2	13 days	12	No return to play	F	19	Volleyball
2	M	19	Football	0	2 moa	14	No return to play	M	19	Crew Heavyweight
3	M	19	Water polo	0	6 days	6	24 days	M	19	Volleyball
4	M	20	Football	1	24 daysb	17 (1st), 77(2nd)	31 days	M	21	Crew lightweight
5	F	21	Basketball	1	9 days	6	9 days	F	21	Volleyball
6	F	18	Rugby	0	17daysc	23	No return to play	F	18	Swimming
7	M	21	Ice hockey	0	3 days	5	12 days	M	21	Volleyball
8	M	20	Football	0	6 days	5	15 days	M	18	Swimming
9	M	20	Basketball	1	9 days	6	12 days	M	18	Squash
10	M	19	Football	0	18 days	10	22 days	M	18	Crew heavyweight
11	M	21	Ice hockey	3	15 days	162	No return to play	M	22	Cross country
12	M	20	Lacrosse	0	17 days	10	23 days	M	22	Track
13	M	20	Wrestling	0	11 days	3	18 days	M	22	Track
14	M	19	Ice hockey	1	2 days	4	23 days	M	18	Crew heavyweight
15	M	21	Sprint foot ball	1	13 days	7	16 days	M	22	Track

^aNot normal at 2 weeks, not repeated until 2 months since season over.

^bReturned to play after 1^st injury at 31 days, sustained a 2^nd concussion and decided not to return to play.

^cNo return to play, season was over.