Table 1

Correlation matrix between health outcomes in ankylosing spondylitis

		SF-36 MCS	SF-36 PCS	BASFI	BASDAI	ASDAS	BASMI	mSASSS	ASspiMRI-a
SF-36 MCS	r	1	−0.01	−0.28	−0.25	−0.13	−0.07	0.04	0.08
SF-36 MCS	p Value	NA	0.88	<0.001	<0.001	0.051	0.279	0.596	0.255
SF-36 PCS	r		1	−0.58	−0.47	−0.40	−0.20	−0.10	0.13
SF-36 PCS	p Value		NA	<0.001	<0.001	<0.001	0.004	0.154	0.051
BASFI	r			1	0.45	0.38	0.42	0.18	0.04
BASFI	p Value			NA	<0.001	<0.001	<0.001	0.008	0.535
BASDAI	r				1	0.68	−0.03	−0.13	−0.12
BASDAI	p Value				NA	<0.001	0.631	0.064	0.079
ASDAS	r					1	0.11	0.11	0.14
ASDAS	p Value					NA	0.103	0.127	0.045
BASMI	r						1	0.59	0.30
BASMI	p Value						NA	<0.001	<0.001
mSASSS	r							1	0.38
mSASSS	p Value							NA	<0.001
ASspiMRI-a	r								1
ASspiMRI-a	p Value								NA

p Values <0.05 are highlighted in bold.
ASDAS, Ankylosing Spondylitis Disease Activity Score; ASspiMRI-a, Ankylosing Spondylitis spinal MRI activity; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Functional Index; BASMI, linear definition of the Bath Ankylosing Spondylitis Metrology Index; mSASSS, modified Stoke Ankylosing Spondylitis Spine Score; SF-36 PCS, SF-36 Physical Component Summary Score; SF-36 MCS, SF-36 Mental Component Summary Score.