Table 3.

Correlation analysis for serum interleukin 34 (IL-34) and clinical data in patients with RA.

Variables	Spearman Rank Correlation Coefficient (r)	p
DAS28	0.053	0.588
ESR	0.166	0.079
CRP	0.095	0.328
RF titer	0.282^*	0.004
Anti-CCP antibody titer	0.491^**	< 0.001
Mean prednisolone dose for previous 1 month	0.034	0.719
BMD (g/cm²)
Lumbar	−0.019	0.882
Femur, neck	−0.090	0.486
Femur, trochanter	−0.046	0.729
Femur, upper neck	−0.181	0.239
BMD, T score
Lumbar	−0.066	0.609
Femur, neck	−0.087	0.503
Femur, trochanter	0.077	0.563
Femur, upper neck	−0.199	0.195
TSS	−0.039	0.708
TSS, erosion	−0.074	0.475
TSS, joint space narrowing	−0.034	0.746

↵* p < 0.01,
↵** p < 0.001.
DAS28: Disease Activity Score 28; ESR: erythrocyte sedimentation rate; CRP: C-reactive protein; RF: rheumatoid factor; anti-CCP: anticyclic citrullinated peptide; BMD: bone mineral density; TSS: total Sharp score.