The impact of age on absolute cell numbers of T cell subsets (n = 33).

<p>A) Absolute number of CD3+, CD4+, CD8+ T cells increased in an age-dependent manner (<i>P</i><0.05). B) The absolute number of CD45RA+ cells was not correlated with age (<i>P</i>≥0.46). C) Absolute numbers of cell negative for CD28 (CD28-) increased with age (<i>P</i>≤0.01). The black line represents the results of linear regression analysis for CD3+, the black dashed line for CD4+, the black dotted line for CD8+, the grey dotted line for CD4+ CD28-, and the black dash-dotted line for CD8+ CD28- lymphocyte subtypes.