Table 3. .

Quiet-Stance Performance

Stance Variable	Group
	Concussion		Control	P Value: Concussion Versus Control
	Initial Examination	After Symptom Resolution		Initial	After Symptom Resolution
Quiet stance				(Wilks λ = .98) .88	(Wilks λ = .97) .70
	Mean (95% Confidence Interval)
RMS sway, m/s2	0.18 (0.13, 0.23)	0.24 (0.16, 0.32)	0.20 (0.16, 0.25)	N/A	N/A
95% Ellipse sway area, degrees2	10.3 (3.9, 16.7)	20.6 (9.46, 31.8)	12.5 (6.8, 18.2)	N/A	N/A
Coronal-plane RMS sway, °	0.94 (0.68, 1.20)	1.23 (0.79, 1.68)	1.04 (0.81, 1.26)	N/A	N/A
Sagittal-plane RMS sway, °	0.46 (0.32, 0.60)	0.61 (0.42, 0.79)	0.54 (0.42, 0.66)	N/A	N/A
Quiet stance + cognitive task				(Wilks λ = .96) .49	(Wilks λ = .94) .41
RMS sway, m/s2	0.24 (0.20, 0.28)	0.28 (0.22, 0.34)	0.26 (0.22, 0.30)	N/A	N/A
95% Ellipse sway area, degrees2	15.2 (8.1, 22.4)	25.7 (14.7, 36.7)	22.3 (15.8, 28.7)	N/A	N/A
Coronal-plane RMS sway, °	1.22 (1.01, 1.43)	1.40 (1.12, 1.67)	1.26 (1.07, 1.45)	N/A	N/A
Sagittal-plane RMS sway, °	0.59 (0.44, 0.73)	0.76 (0.56, 0.97)	0.74 (0.61, 0.87)	N/A	N/A

Abbreviations: N/A, not applicable due to lack of omnibus test significance; RMS, root mean square.