Is early TMJ involvement in children with juvenile idiopathic arthritis clinically detectable? Clinical examination of the TMJ in comparison with contrast enhanced MRI in patients with juvenile idiopathic arthritis

Table 2 Analysis of MRI deformity vs. MOC, corresponding SDS-values and centiles

		MRI deformity
Factor	Examination method	ANOVA	Bonferroni group comparison
		p-value	Severity subgroups		p-value	Mean difference (S1 - S2)	CI95 (lower, upper)
		p-value	S1	S2	p-value	Mean difference (S1 - S2)	CI95 (lower, upper)
Maximal mouth opening capacity	Orthodontic (n = 76)		0	1	0.467	3.0	−2.1, 8.1
		0.001*	0	2	0.001*	6.9	2.5, 11.1
			1	2	0.378	3.8	−2.2, 9.8
	Rheumatologic (n = 74)		0	1	0.076	4.7	−0.3, 9.7
		0.002*	0	2	0.004*	6.0	1.6, 10.4
			1	2	1.000	1.3	−4.7, 7.4
SDS values	Orthodontic (n = 72)		0	1	0.312	0.6	−0.3, 1.5
		<0.001*	0	2	<0.001*	1.6	0.8, 2.4
			1	2	0.760	1.0	−0.1, 2.0
	Rheumatologic (n = 70)		0	1	0.071	0.9	−0.1, 1.9
		<0.001*	0	2	<0.001*	1.5	0.6, 2.3
			1	2	0.769	0.5	−0.6, 1.7
Centiles	Orthodontic (n = 72)		0	1	0.142	19.5	−4.2, 43.3
		<0.001*	0	2	<0.001*	42.3	22.0, 62.5
			1	2	0.147	22.7	−5.1, 50.5
	Rheumatologic (n = 70)		0	1	0.023*	26.9	2.8, 50.9
		<0.001*	0	2	<0.001*	42.5	21.4, 63.5
			1	2	0.552	15.6	−12.9, 44.2

One way Anova with post-hoc Bonferroni test to compare the MRI to the MOC’s and the corresponding SDS-values and centiles. All continuous variables were normally distributed. Mean difference between groups with upper and lower 95 % confidence interval (CI95) is provided
MRI deformity subgroups: 0 = normal, 1 = mild, 2 = severe
*p-value < 0.05