MRI contributes to accurate and early diagnosis of non-radiographic HLA-B27 negative axial spondyloarthritis

Table 3 Associations and strengths between the presence of BME and structural damage of MRI-SIJs in 103 nr-axSpA subjects (Subject numbers, Pearson Chi-Square & phi scores)

	Sclerosis		Erosion		fJSW		DP		TP
	( +)	(–)	( +)	(–)	( +)	(–)	( +)	(–)	( +)	(–)
BME ( +) (%)	28/60 (47.7%)	8/43 (18.6%)	35/99 (45.4%)	1/4 (25%)	16/23 (69.6%)	20/80 (25%)	13/36 (36.1%)	23/67 (34.3%)	15/22 (68.2%)	21/81 (25.9%)
p value	0.004**		0.670		< 0.001***		0.856		< 0.001***
phi scores	0.290		0.670		0.389		0.018		0.363

BME bone marrow edema, MRI magnetic resonance imaging, SIJ sacroiliac joint, nr-axSpA nonradiographic spondyloarthritis, JSW joint space widening, DP double positive, dual presence of sclerosis and erosion on SIJ MRI, TP triple positive, simultaneous presence of sclerosis, erosion, and fJSW on MRI-SIJs
**p value < 0.01
***p value < 0.001; phi scores were used for association measure between binary variables

ISSN: 1479-5876