Table 4.

Test characteristics of the TMJ protocol for different cut-off points; assessments by the rheumatologist

	no TMJ involv.	TMJ involv	Sens	Spec	PPV	NPV	p
Protocol score
at least 1 pos score (n)	34	40
JADAS-27 (sd)	2.0 (2.98)	5.0 (7.13)					0.029
JADAS-27 ≥ 2			0.65	0.55	0.55	0.65
JADAS-27 ≥ 3.8			0.65	0.51	0.38	0.77
Protocol score
at least 2 pos scores (n)	49	25
JADAS-27 (sd)	2.2 (3.12)	6.39 (8.36)					0.003
JADAS-27 ≥ 2			0.47	0.78	0.64	0.63
JADAS-27 ≥ 3.8			0.57	0.77	0.52	0.80
Protocol score
at least 3 pos score (n)	60	14
JADAS-27 (sd)	2.37(3.14)	8.94 (10.2)					< 0.001
JADAS-27 ≥ 2			0.41	0.85	0.70	0.63
JADAS-27 ≥ 3.8			0.52	0.84	0.60	0.80
Protocol score|
at least 4 pos scores (n)	64	10
JADAS-27 (sd)	3.31 (5.69)	5.56 (6.26)					0.306
JADAS-27 ≥ 2			0.18	0.90	0.60	0.56
JADAS-27 ≥ 3.8			0.22	0.90	0.50	0.72

JADAS-27: juvenile arthritis disease activity score. Sens: sensitivity; Spec: specificity; NPV: negative predictive value; PPV: positive predictive value. p: probability (Students t-test).