Table 1.

Age at the Time of First Baseline Scan, Body Mass Index, Years of Previous Football Experience, Past Concussion History, and SCAT Scores with Median, 25th and 75th Percentiles, Minimum and Maximum, as Well as Incidence of ADHD and Learning Disabilities in Football (n = 59; 37 without Past Concussion, 22 with Past Concussion) and Volleyball (n = 32)

	Football median (25th, 75th percentile) [min, max]		Volleyball median (25th, 75th percentile) [min, max]	Z (p value)
Age, years	18.67 (18.43, 19.21) [17.91, 27.70]		19.23 (18.79, 20.46) [18.32, 21.76]	3.13 (0.002)
Body mass index	29.16 (26.09, 32.87) [21.70, 38.18]		23.09 (22.50, 24.31) [19.93, 27.27]	–6.84 (0)
Years of previous tackle football experience	9 (7, 11) [4, 15]		0 (0, 0) [0, 2]	–7.89 (0)
No. of athletes with past concussion	22/59		2/32	(0.001)
SCAT score (without/with past concussion)	54 (51, 57) [42, 61]	55 (54, 57) [51, 61]		–1.02 (0.309)
No. of athletes with ADHD	3/59		2/32	(1)
No. of athletes with learning disabilities	1/59		0/32	(1)
Caucasian	25/59		25/32	(0.002)
African American	22/59		0/32	(0)
Other/mixed/unknown	12/59		7/32	(1)

Median age, body mass index, and years of previous football experience (followed by 25th and 75th percentiles, and minimum and maximum) compared between football and volleyball athletes. SCAT scores were compared within football only (between football athletes without past concussion [left] and with past concussion [right]). A Wilcoxon rank sum test was utilized for age, body mass index, years of previous football experience, and SCAT scores, whereas a Fisher's exact test was performed for all other rows. The one athlete with a learning disability had dyslexia.

Bold highlights p < .05 uncorrected.

ADHD, attention deficit hyperactivity disorder; SCAT, Standardized Concussion Assessment Tool.