CD8A and rheumatoid arthritis: Age (r = −0.2847, p = 0.075) and RA disease activity (DAS28-ESR, DAS28-CRP, SDAI, and CDAI, p = 0.61, p = 0.87, p = 0.93, and p = 0.89, respectively) were not associated with the abundance of CD8+ Tregs.