Table 4.

Bivariate analysis of temporomandibular disorder (TMD) symptoms and risk factors

		TMD symptom
		No TMD	Mild TMD	Moderate TMD	Severe TMD	p value
Open bite
Absent	N	27	204	40	16	0.660, NS
	%	9.4%	71.1%	13.9%	5.6%
Present	N	2	10	1	0
	%	15.4%	76.9%	7.7%	0.0%
Bruxism
Absent	N	14	158	22	6	<0.001*
	%	7.0%	79.0%	11.0%	3.0%
Present	N	15	56	19	10
	%	15.0%	56.0%	19.0%	10.0%
Overbite
0–3 mm	N	29	203	36	14	0.278 NS
	%	10.3%	72.0%	12.8%	5.0%
4–6 mm	N	0	10	4	2
	%	0.0%	62.5%	25.0%	12.5%
>6 mm	N	0	1	1	0
	%	0.0%	50.0%	50.0%	0.0%
Overjet
0–3 mm	N	25	194	37	14	0.641, NS
	%	9.3%	71.9%	13.7%	5.2%
4–6 mm	N	4	13	3	2
	%	18.2%	59.1%	13.6%	9.1%
>6 mm	N	0	7	1	0
	%	0.0%	87.5%	12.5%	0.0%
Molar relation
Bilateral class I	N	21	165	28	9	0.388, NS
	%	9.4%	74.0%	12.6%	4.0%
Bilateral class II div I	N	3	19	4	3
	%	10.3%	65.5%	13.8%	10.3%
Bilateral class II div II	N	0	3	0	0
	%	0.0%	100.0%	0.0%	0.0%
Bilateral class III	N	0	0	0	0
	%	0.0%	0.0%	0.0%	0.0%
Different classes on the both sides	N	5	27	8	4
	%	11.4%	61.4%	18.2%	9.1%
Bimaxillary protrusion	N	0	0	1	0
	%	0.0%	0.0%	100.0%	0.0%
Cross bite
Absence of crossbite	N	23	168	34	13	0.516, NS
	%	9.7%	70.6%	14.3%	5.5%
Presence of anterior crossbite	N	6	35	6	2
	%	12.2%	71.4%	12.2%	4.1%
Presence of posterior bilateral crossbite	N	0	2	1	1
	%	0.0%	50.0%	25.0%	25.0%
Presence of posterior unilateral crossbite	N	0	9	0	0
	%	0.0%	100.0%	0.0%	0.0%