Anti-hnRNP B1 (RA33) Autoantibodies Are Associated with the Clinical Phenotype in Russian Patients with Rheumatoid Arthritis and Systemic Sclerosis

Table 4

Correlation of anti-hnRNP B1 autoantibodies with clinical characteristics of patients with RA.

	Valid number of patients	Spearman	𝑡 (𝑁−2)	𝑃
Age	161	0.229447	2.97253	0.003
Duration of disease	144	−0.259660	−3.20410	0.002
ESR	156	0.197243	2.49678	0.014
CRP	157	0.259968	3.35182	0.001
DAS28	120	−0.128757	−1.41040	0.161
Smoking habit	108	−0.120022	−1.24470	0.216
Anti-CCP antibody	108	0.105416	1.09141	0.278
RF	157	0.027336	0.34046	0.734
Joint space narrowing hand	75	0.309004	2.77598	0.007
Joint space narrowing feet	74	0.212152	1.84210	0.070
Erosion feet	74	0.156521	1.34470	0.183

CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; CCP: citrullinated cyclic peptide; DAS28: disease activity score of 28 joints; RF: rheumatoid factor.