Table 3.

Comparison of joint scores between different patient groups

	RA	Non-RA*	HC	p-value RA vs non-RA	p-value RA vs HC	p-value non-RA vs HC
Synovitis MRI scores	6 (1.5–9)	1.5 (0–3)	0 (0–1)	0.004	0.004	0.10
Erosion MRI scores	1 (0–3.75)	0 (0–1)	0 (0–0)	0.07	0.038	0.08
Swollen joint count	2.5 (1–4)	0 (0–0)	NA	< 0.001	N/A	N/A
Tender joint count	6.5 (3–13.3)	3 (0.5–6)	NA	0.13	N/A	N/A
Bursitis	2 (0–2.75)	1 (0–1)	0 (0–0)	0.043	0.028	0.043
Enthesitis	1.5 (0–3.75)	1 (0–2.75)	0 (0–0)	0.99	0.031	0.010
Tenosynovitis	1 (0–1)	0 (0–0.5)	0 (0–0)	0.88	0.09	0.35

Columns 2–4 show median (interquartile range) of each group. Columns 5–7 show p-value of pairwise Mann-Whitney U-test between each set of groups with correction for multiple comparisons. Asterisk symbol indicates that two patients in the non-RA group had spine-only imaging, and so these have been removed for this analysis