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Table 1: MR imaging vs. clinical critera according to the American College of Rheumatology
Comparison n TP TN FP FN Sens Spec PPV NPV
MR vs ACR (all patients) 64 25 32 1 6 80.6 97.0 96.2 84.2
MR vs ACR (<10 days of steroids) 50 24 21 1 4 85.7 95.5 96.0 84.0
MR vs ACR (>10 days) 14 1 11 0 2 33.3 100 100 84.6
Histo vs ACR 32 21 5 0 6 77.8 100 100 45.5
MR vs ACR (patients with histo) 32 22 5 0 5 81.5 100 100 50.0
MR vs histo 32 19 8 3 2 90.5 72.7 86.4 80.0
Wall thickness vs ACR (all patients) 64 22 26 7 9 71.0 78.8 75.9 74.3
Note:—Results of the MR evaluation and temporal artery biopsy in the diagnosis of giant cell arteritis (GCA). The number of subjects (n), true-positive (TP), true-negative (TN), false-positive (FP), and false-negative (FN) cases, as well as the values for sensitivity (Sens), specificity (Spec), positive predictive value (PPV), and negative predictive value (NPV) are reported for all of the patients in the study and various subgroups. Histo indicates histology; ACR, American College of Rheumatology.

Comparison	n	TP	TN	FP	FN	Sens	Spec	PPV	NPV
MR vs ACR (all patients)	64	25	32	1	6	80.6	97.0	96.2	84.2
MR vs ACR (<10 days of steroids)	50	24	21	1	4	85.7	95.5	96.0	84.0
MR vs ACR (>10 days)	14	1	11	0	2	33.3	100	100	84.6
Histo vs ACR	32	21	5	0	6	77.8	100	100	45.5
MR vs ACR (patients with histo)	32	22	5	0	5	81.5	100	100	50.0
MR vs histo	32	19	8	3	2	90.5	72.7	86.4	80.0
Wall thickness vs ACR (all patients)	64	22	26	7	9	71.0	78.8	75.9	74.3