CD4 and infection: A comparison of the three groups using the Kruskal–Wallis test (H) confirmed that there was no statistically significant difference in age (H = 5.18; p = 0.08), CD4 T-cell count (H = 5.66; p = 0.06), and the number of years since infection (H = 0.7; p = 0.70) (Table 5).