Table 1.

Upper incisor widths (SIW) and arch width values (in mm) described in terms of arithmetic means and standard deviations (SD)

Variables	Measured		Calculated		P
	Mean	SD	Mean	SD
SIW	30.52	1.86	-	-	-
Arch widths
Maxilla
4-4	35.66	2.36	38.15	2.32	0.000
6-6	46.07	2.67	47.71	2.88	0.000
Mandible
4-4	34.51	2.57	38.15	2.32	0.000
6-6	46.78	3.15	47.71	2.88	0.031