Figure 5.

ROC curves (sensitivity vs. 1 − specificity) when distinguishing AIDS and AIDS-free men (SC and SP groups combined) using three different criteria: CD3⁺ slope before IP (β̂_i1), CD3⁺ slope after IP (β̂_i2), and the change in log₁₀(CD3⁺) slopes from before IP to after IP (β̂_i2 − β̂_i1). The arrow indicates the point of maximal sensitivity and specificity. ∗ and + denote the characteristics when distinguishing individuals by using the statistical criteria (i.e., classification based on F-statistics) for all individuals and those with 15 or more visits, respectively.