Table 4. Concurrent validity between 2-D knee FPPA and 3-D knee valgus among normal group and excessive DKV group at 45° SLS.

Group	Lower limb	Methods	95% CI	r-value	p-value
Normal	Dominant	2-D SLS	-2.97-2.03	0.07	0.80
		3-D SLS	-2.38-3.10
	Non-dominant	2-D SLS	-2.61-1.61	0.90	0.001
		3-D SLS	-3.03-0.72
Excessive DKV	Dominant	2-D SLS	-7.18 to -0.86	0.38	0.13
		3-D SLS	-7.29 to -1.00
	Non-dominant	2-D SLS	-6.79 to -0.48	0.58	0.02
		3-D SLS	-4.11 to 2.21

Abbreviation: FPPA = frontal plane projection angle; CI = confidence interval; DKV= dynamic knee valgus; 2-D= two-dimensional; 3-D= three-dimensional; SLS= single leg squat. Bolded values indicate statistically significant relationshps, p<0.05.