Table 1.

Anova test for upper and lower arches of male, female, and combined cases.

Cases		Sum of squares	df	Mean square	F	Sig.
Upper male	Between groups	0.637	17	0.037	22.474	.000
Within groups	0.570	342	0.002
Total	1.207	359
Upper female	Between groups	0.637	17	0.037	22.474	.000
Within groups	0.570	342	0.002
Total	1.207	359
Upper combined	Between groups	2.172	17	0.128	29.560	.000
Within groups	3.034	702	0.004
Total	5.205	719
Lower male	Between groups	1.047	17	0.062	9.128	.000
Within groups	2.308	342	0.007
Total	3.356	359
Lower female	Between groups	0.380	17	0.022	15.025	.000
Within groups	0.509	342	0.001
Total	0.890	359
Lower combined	Between groups	1.191	17	0.070	14.209	.000
Within groups	3.462	702	0.005
Total	4.653	719

^*P < 0.001.