CD4 and HIV infectious disease: In addition they had a significantly longer mean of assumed duration of HIV infection but a lower mean of CD4 count nadir (7.1 ± 4.1 years vs. 5.9 ± 3.4 years and 188.9 ± 142.7 cells/μL vs. 239.9 ± 182.8 cells/μL, respectively) as shown in Table 2.