Table 2.

Comparison of BASDAI, ASDAS-CRP, and secondary criteria in patients with spondyloarthritis according to fibromyalgia status. Data presented as median (IQR).

Criteria	SpA, n = 85	SpA-FM, n = 18	p	axSpA, n = 69	axSpA-FM, n = 12	p	pSpA, n = 16	pSpA-FM, n = 6	p
BASDAI	2.2 (3.1)	4.2 (4.2)	0.0068	2.2 (3.2)	3.2 (5.4)	0.1587	2.2 (2.5)	4.7 (3.0)	0.0064
BASDAI 1	2.5 (4)	4.8 (5.4)	0.0861	2.5 (4.8)	3.5 (6.3)	0.7139	2 (4.5)	5.5 (4.5)	0.0105
BASDAI 2	2.5 (5)	5.5 (4.8)	0.0137	2.5 (5)	5.3 (6)	0.1534	2 (2.5)	5.5 (4.1)	0.0131
BASDAI 3	1 (3.5)	3.8 (5)	0.0018	0.5 (2.5)	3.3 (5.9)	0.0333	2.8 (3.8)	5.5 (3.1)	0.0199
BASDAI 4	1 (3.3)	4.8 (4.4)	0.0019	0.5 (2.5)	3.3 (5.3)	0.0427	2.3 (3.9)	5 (2.5)	0.0313
BASDAI 5	2 (4.5)	3.8 (4.1)	0.1450	2.5 (4.5)	2.5 (4.9)	0.5428	1.8 (2.5)	4 (2.6)	0.0459
BASDAI 6	1 (2.5)	2 (1.9)	0.9683	1 (2.5)	2.3 (2.6)	0.8500	1.8 (2.2)	1.5 (3)	0.7922
ASDAS-CRP	2 (1.3)	2.7 (2)	0.1264	2 (1.3)	2.5 (2.3)	0.5148	2 (1.2)	2.7 (1.2)	0.1307
PtGA	2.5 (4)	3.8 (4.4)	0.2146	2 (4.3)	3.6 (5.1)	0.3403	2.8 (3.3)	4.3 (3)	0.415
CRP, mg/l	4 (7)	3.5 (8.8)	0.8646	4 (7.5)	2 (8)	0.5612	4 (7)	7.5 (11)	0.5213
Tender joints, n = 102	0 (1)	2.8 (4.5)	< 0.0001	0 (0.8)	4.5 (4.5)	< 0.0001	1 (2)	4 (9.75)	0.006
Swollen joints, n = 102	0 (0)	0 (0)	0.4041	0 (0)	0 (0)	0.5812	0 (1)	0 (0.5)	0.3233
BASFI, n = 75				0.9 (2.5)	1.4 (2.7)	0.2921
BASMI, n = 76				1.5 (3.8)	1.5 (1.8)	0.3526

P values determined using Mann-Whitney t test; p < 0.05 considered significant. BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; ASDAS-CRP: Ankylosing Spondylitis Disease Activity Score–C-reactive protein; IQR: interquartile range; SpA: spondyloarthritis; axSpA: axial SpA; pSpA: peripheral SpA; FM: fibromyalgia; PtGA: patient’s global assessment; BASFI: Bath Ankylosing Spondylitis Functional Index; BASMI: Bath Ankylosing Spondylitis Metrology Index.