NC = F, noncompleter = failure. b EFV, efavirenz; ZDV, zidovudine; 3TC, lamivudine; IDV, indinavir; NRTI, nucleoside reverse transcriptase inhibitor; NFV, nelfinavir. c C. I., confidence interval for proportion of patients in response. d S. E. M., standard error of the mean. ---, not performed.