Scores were +3.5 for age <30 years, +2.5 for BMI of 18.5–29.9 kg/m2 or +14.5 for BMI of >30 kg/m2, +7.0 for non-anemia, +17.0 for CD4 count >200 cells/mm3 or +5.5 for 100–199 cells/mm3, and +8.5 for no prior AIDS-defining illness. This evidence concerns the gene CD4 and AIDS.