Table 4.

Multivariable analysis of low BMD in ASAS-positive group.

Variables	Odds ratio (95% CI)	P-value
Male	6.738 [1.229–36.940]	0.0280
Enthesitis	3.847 [1.227–12.058]	0.0208
Hs CRP	1.002 [0.967–1.039]	0.9041
MRI SI-positive	2.375 [0.688–8.199]	0.1711
Sacroilitis X-ray	3.229 [0.846–12.231]	0.0863
MRI Spine	1.248 [0.318–4.896]	0.7504
ASDAS ESR	2.100 [0.958–4.603]	0.0639
BASFI	0.964 [0.711–1.308]	0.8149
IL-31*	1.367 [1.007–1.855]	0.0449

^*Odds ratio for each 10-pg/mL increase in IL-31 level.