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

Table 3 Summary of enhancement ratios and relative signal intensity changes for synovial 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)	0.090	−0.0478 – 0.227	0.04	-	–	–
Rheumatologic control (60)	0.480	0.335 – 0.626	–	0.04	0.47	0.03
Mild (40)	1.045	0.824 – 1.266	0.001	<0.0001	0.001	<0.0001
Moderate/severe (34)	2.188	1.786 – 2.577	<0.0001	<0.0001	<0.0001	<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)	0.660	0.401 – 0.919	1.00	–	–	–
Rheumatologic control (60)	0.433	0.229 – 0.638	–	1.00	1.00	0.18
Mild (40)	0.919	0.640 – 1.197	0.10	1.00	0.20	1.00
Moderate/severe (34)	1.953	1.487 – 2.420	<0.0001	<0.0001	<0.0001	<0.0001

The P values represent comparisons between TMJs with mild or moderate/severe synovial 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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