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CD4 T cell GSB is lost progressively in HIV disease. Distribution of median baseline GSB levels in CD4 T cells. The vertical bar placed at 1.05 on the GSB axis locates the optimal value (computed by ROC analysis) for discriminating survivors from nonsurvivors among subjects with CD4 counts below 200/μl. Numbers of subjects and statistical data for groups shown are reported in Table 1. See Methods for GSB units; see legend to Table 1 for definition of the NoTS cohort.
