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. Author manuscript; available in PMC: 2016 Jun 7.
Published in final edited form as: J Acquir Immune Defic Syndr. 2016 Jun 1;72(2):162–170. doi: 10.1097/QAI.0000000000000928

Figure 1.

Figure 1

Mean CD4/CD8 ratios over time in HIV-positive WIHS women. Note: Several cross-sectional studies have observed higher CD4/CD8 ratios in older vs. younger healthy adults.28-30 It is unclear whether the higher mean CD4/CD8 ratios observed at later vs. earlier WIHS visits shown in Figure 1 reflect: i) age-related increases in CD4/CD8 ratios, ii) increases in CD4/CD8 ratios due to improvements in HIV treatment and clinical care since 1994, iii) unmeasured factors, or iv) a combination of i-iii.