TNF and rheumatoid arthritis: Median and IQR values observed for TNFα are as follows: healthy subject group: 1.54 (0.98–1.66), NST group: 0.92 (0.66–4.82), RA patients under LFN treatment: 1.5 (0.63–5.37) and RA patients under ADA treatment: 0.88 (0.37–1.25).