Patients with RA for 0-5 years had the highest IL-6 peak at 65-70 pg/mL, while those with RA for 5-10 years peaked at 55-60 pg/mL, and patients with 10+ years of RA showed a peak around 50 pg/mL, but with a wider distribution extending up to 150 pg/mL, indicating increased variability over time. Here, IL6 is linked to rheumatoid arthritis.