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CD4 cell counts increments (ΔCD4) of older and younger patients during the study period. Patients were stratified into 4 subgroups according to their initial CD4 cell counts at the time of HIV diagnosis. ΔCD4 was determined as the mean ± SD differences between CD4 cell counts at the end of the study (last visit) and the initial CD4 (at HIV diagnosis) cell counts for each patient. ∗P not significant.
