Evaluation of Vitamin D Status in Rheumatoid Arthritis and Its Association with Disease Activity across 15 Countries: “The COMORA Study”

Table 1

Demographic and disease characteristics of rheumatoid arthritis patients.

Characteristics
Age (years)	57.9 ± 12.8 18–88]
Female sex	1172 (82.9)
High educational level
(≥secondary)	950 (67.2)
BMI (kg/m^2)	26.3 ± 5 15–53.1]
Current/past smoking	214 (15.1)
Disease duration (years)	8.3 (3.6–15.2)
DAS 28	3.5 ± 1.4 0–8.2]
Disease activity
High	231 (16.3)
Moderate	576 (40.8)
Low	208 (14.7)
Remission	398 (28.2)
Vitamin D level	27.3 ± 15.1 0.1–151]
HAQ	1 ± 0.6 0.4–1]
Glucocortocoid therapy intake	691 (48.9)
Current dose of glucocortocoid (mg/day)	0 0–5]
DMARDs
Immunosuppressor	17 (1.2)
APS	238 (16.8)
Salazopyrin	70 (4.9)
Golds	57 (4)
Methotrexate	763 (54)
Biotherapy	173 (12.2)
Comorbidities
Hypertension	494 (35)
Diabetes	133 (9.4)
Cancer	42 (3)
Lung diseases	110 (7.8)
Renal diseases	40 (2.8)
Anemia and blood diseases	165 (11.8)
Hepatitis B	39 (2.8)
Hepatitis C	18 (1.3)
Liver diseases	51 (3.6)
Ulcer and stomach diseases	166 (11.8)

Mean ± DS; number and percentage; median; BMI: body mass index; DAS28: Disease Activity Score using 28 joints; HAQ: health assessment questionnaire; APS: antimalarial drug, DMARDs: Disease-Modifying Antirheumatic Drugs.