Table 1.

Comparison of measurements between right and left sides of the arch

Tooth	Side	COS					WALA-FA distance					CW
		Mean	SD	Mean difference (95% CI)	t	p	Mean	SD	Mean difference (95% CI)	t	p	Mean	SD	Mean difference (95% CI)	t	p
1. Premolar
	Left (mm)	1.09	0.78	−0.33 (−0.086, −0.59)	−2.712	0.010	1.04	0.61	0.02 (−0.16, 0.2)	0.207	0.837	25.22	7.91	0.57 (−1.70, 2.83)	0.505	0.616
	Right (mm)	1.42	0.70				1.02	0.46				24.65	6.16
2. Premolar
	Left (mm)	1.40	0.48	−0.26 (−0.10, −0.42)	−3.287	0.002	1.86	0.63	0.14 (−0.04, 0.32)	1.602	0.117	21.50	6.98	−0.03 (−1.93, 1.88)	−0.031	0.976
	Right (mm)	1.66	0.59				1.72	0.52				21.53	6.58
1. Molar
	Left (mm)	1.33	0.55	−0.41 (−0.25, −0.56)	−5.341	<0.001	2.72	0.62	−0.01 (−0.19, 0.18)	−0.038	0.970	9.95	3.75	−0.41 (−0.70, 1.87)	−0.645	0.523
	Right (mm)	1.74	0.53				2.73	0.70				10.36	4.73

SD: standard deviation; COS: curve of Spee; CW: curve of Wilson; WALA-FA distance: basal arch-dental arch distance