Table 2: Clinical and laboratory characteristics of patients with RA.


Disease duration (years), mean SD
Females (%)135 (98.5)
DAS-28, mean ± SD
HAQ-DI, mean SD
Laboratory findings
 Serum Rheumatoid factor (UI/L), mean ± SD200.5 384.9
 C-reactive protein (mg/L), mean ± SD17.0 25.9
 Erythrocyte sedimentation rate (mm/h),
 mean ± SD
30.7 12.6

Quantitative variables are expressed as means standard deviations (SD) and qualitative variables as frequencies and percentages (%) as noted. Abbreviations: RA: rheumatoid arthritis, DAS-28: disease activity score of 28 joints, HAQ-DI: Health Assessment Questionnaire Disability Index.