Patients prescribed nevirapine with high baseline CD4 counts (>200 cells/mm3 for women and >400 cells/mm3 for men), pregnant women, those with TB, and patients who initiated other regimens were removed from further analysis, leaving 2,385 subjects – 2,254 (94.5%) on TDF-3TC-EFV and 131 (5.5%) on TDF-3TC-NVP. Here, CD4 is linked to tuberculosis.