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(a) ROC curve for determining the optimum cut-off of CD4 percentage between CDC groups A1 + B1 + C1 and A2 + B2 + C2, based on CD4 counts. (b) ROC curve for determining the optimum cut-off of CD4 percentage between CDC groups A2 + B2 + C2 and A3 + B3 + C3 based on CD4 counts.
