Long-term results at 168 weeks of study 006 (160 patients completed study on treatment with EFV +IDV, 196 patients with EFV + ZDV + 3TC and 127 patients with IDV + ZDV + 3TC, respectively), suggest durability of response in terms of proportions of patients with HIV-RNA < 400 copies/ ml, HIV-RNA < 50 copies/ ml and in terms of mean change from baseline CD4 cell count.