Fig. 1

Correlations between naïve T cells and age. Scatter plots and regression lines demonstrated the relationship between T cell parameters with age in ESRD patients. Linear regression analysis showed that both CD4⁺ and CD8⁺ naïve T cell counts were negatively correlated to age. After dividing patients into 5 groups according to age period, CD4⁺ naïve T cell count decreased significantly with age in patients aged from 20 to 69 years old. Afterwards, there was no significant difference in CD4⁺ naïve T cell count, and even a little increase in 80–89 years old. CD8⁺ naïve T cell count decreased significantly with age in patients aged from 20 to 89 years old