Table 3. Frequencies of several functional and occlusal parameters. In this table the qualitative variables are presented.

Variable	Sleep bruxism group	Controls	P
Right canine (n=68)	17 Class I	11 Class I	0.455a
	27 Class II	9 Class II
	3 Class III	1 Class III
	11 Missing	12 Missing
Left canine (n=68)	24 Class I	12 Class I	0.707a
	22 Class II	8 Class II
	1 Class III	1 Class III
	11 Missing	12 Missing
Right first molar (n=65)	14 Class I	9 Class I	0.324a
	19 Class II	10 Class II
	11 Class III	2 Class III
	14 Missing	12 Missing
Left first molar (n=66)	21 Class I	11 Class I	0.425a
	14 Class II	7 Class II
	11 Class III	2 Class III
	12 Missing	13 Missing
Anterior crowding (n=68)	0: n=9	0: n=3	0.644a
	1: n=34	1: n=15
	2: n=3	2: n=3
	3: n=1	3: n=0
	11 Missing	12 Missing
Presence of a CO to MI slide (n=91)	41 (70.7%)	14 (42.4%)	0.008a
Lip/cheek biting (n=91)	16 (27.6%)	2 (6.1%)	0.013a

Following to Bonferroni adjustment, significance level amounted to P<0.003.

^aChi-square test.