If the Czech version says: NC = F (non- completer = failure) osoba, která nedokončila studii = selhání léčby. b C. I.; hence the English version should say: NC = F, noncompleter = failure. b C. I., confidence interval. c S. E. M., standard error of the mean. d EFV, efavirenz; ZDV, zidovudine; 3TC, lamivudine; IDV, indinavir.