Table 1: Comparison in selected characteristics between patients with rheumatoid arthritis and healthy controls.
Cases with RA
Age (years), mean SD
Serum IL-6 (pg/mL)
Quantitative variables are expressed as means standard deviations (SD) and qualitative variables as frequencies and percentages (%) as noted. Abbreviations: RA: rheumatoid arthritis, IL-6: interleukin 6. Comparisons between means were performed with unpaired Student’s t-test. Comparisons between proportions were performed with Chi-squared test.