Table 1.

The main patients’ characteristics and disease features

Parameter		Numerical data (%)
Sex distribution	Female  Male	233 (83.2) 47 (16.8)
Age	(years) ± SD	58.07 ± 11.12
Age at diagnosis	(years) ± SD	44.65 ± 13.78
Disease duration	(years) ± SD	14.74 ± 1.63
DAS28 (CRP)		4.76 ± 1.19
HAQ		1.4 ± 0.5
Immunologic profile	RF +  ACPA +	222 (79.3) 178 (63.6)
Extra-articular manifestations	Pulmonary involvement  Ocular involvement  Pericarditis  Kidney involvement  Systemic vasculitis	136 (48.6) 119 (87.5) 22 (16.1) 6 (4.4) 5 (3.6) 3 (2.2)
Coxitis		34 (12.1)
Atlanto-axial dislocation		43 (15.4)

DAS28: disease activity score 28; CRP: C-reactive protein; HAQ: Health Assessment Questionnaire; RF: rheumatoid factor; ACPA: anti-citrullinated protein antibodies; SD: standard deviation