MRI thresholds for discrimination between normal and mild temporomandibular joint involvement in juvenile idiopathic arthritis

Table 4 Summary of enhancement ratios and relative signal intensity changes for condylar enhancement

Enhancement ratio	Mean	95 % confidence interval	P value (RC)	P value (NRC)	P value (NRC 1.5 T)	P value (NRC 3.0 T)
Non-rheumatologic control (48)	0.138	−0.063 – 0.339	1.00	-	–	–
Rheumatologic control (66)	0.112	0.011 – 0.213	–	1.00	0.06	0.16
Mild (53)	0.592	0.380 – 0.804	0.0008	0.005	0.96	<0.0001
Moderate/severe (15)	1.284	0.827 – 1.740	<0.0001	<0.0001	0.007	<0.0001
Relative signal intensity change	Mean	95 % confidence interval	P value (RC)	P value (NRC)	P value (NRC 1.5 T)	P value (NRC 3.0 T)
Non–rheumatologic control (48)	0.588	0.391 – 0.785	<0.0001	–	–	–
Rheumatologic control (66)	0.008	−0.097 – 0.113	–	<0.0001	0.01	<0.0001
Mild (53)	0.470	0.267 – 0.673	0.001	1.00	1.00	0.26
Moderate/severe (15)	0.951	0.542 – 1.360	<0.0001	0.35	0.07	0.51

The P values represent comparisons between TMJs with mild or moderate/severe condylar enhancement (based on qualitative assessment) and the results from the rheumatologic (RC) and non-rheumatologic control groups (NRC). The non-rheumatologic control group was further separated into MRI examinations that were performed under 1.5 T and 3.0 T. Further comparison is made between the two subgroups and the TMJs of JIA patients. The number in () represents the number of TMJs in each group

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