Table 3. Sample classifications used in analysis, separated by fluid type.

Comparison Types by mTBI Risk (HTH)		Sample N	Fluid Type	Ave HTH
Low	0–3 HTH	50	24 saliva 26 serum	0.3
Moderate	4–9 HTH	41	15 saliva 26 serum	6.5
Very Likely	10–65 HTH	50	23 saliva 27 serum	24.2

HTH, Hits to the head (observed by video)