P-value < 0.0001 for mean decrease in HIV-1 RN A; P-value = 0.0060 for mean change in CD4 cell count. d Confidence interval around observed difference of response rates; P-value < 0.0001 from logistic regression model, including stratification factors. e Confidence interval around observed difference of response rates; P-value = not significant. f Confidence interval around observed difference of response rates; P-value from CMH test controlling for stratification factors = 0.427 for de novo, and < 0.0001 for not de novo.