Table 1.

Baseline characteristics in BDNFVal⁶⁶Met (–) vs. BDNFVal⁶⁶Met (+) players (N = 312).

		Met (–) players (N = 221)	Met (+) players (N = 91)	p
Variable (continuous)
Age, years		24 (21–29)	23 (21–27)	0.32
Education, years		15.5 (3.0)	15.8 (2.47)	0.43
Years playing at similar frequencya		11 (7–16)	10 (5–16)	0.50
Variable (categorical)
Gender	Male	167 (76)	58 (64)	0.03
Race	White	148 (67)	66 (72)	0.34
Past/Present Smoker	Yes	67 (30)	23 (25)	0.37
Alcoholic drinks/week	0	60 (27)	17 (19)	0.07
	1–2	99 (45)	34 (37)
	3–7	47 (21)	32 (35)
	8–14	14 (6)	8 (9)
	14+	1 (1)	0 (0)
Lifetime concussion(s)a	0	149 (68)	48 (54)	0.053
	1	31 (14)	20 (22)
	2+	38 (18)	21 (24)

Continuous variables are reported as mean (sd) for education and median (IQR) for age and years at similar frequency. Categorical variables are reported as frequency (%).

^aData missing in five subjects.