Participant Characteristics by HIV and HAART status.

<p>Means (SD), median (25^th –75^th percentile), or proportions.</p><p>PI = protease inhibitor; NNRTI = non-nucleoside reverse transcriptase inhibitor; NRTI = nucleoside reverse transcriptase inhibitor.</p>a<p>P-values are for comparison of HIV− to HIV+ participants.</p>b<p>P-values are for comparison of HIV+/HAART+ to HIV+/HAART− participants.</p>c<p>Illicit drug use was defined as any use of marijuana, nitrite inhalants, crack or cocaine, stimulants, or other illicit drugs since the last MACS visit.</p><p>*P < 0.05, compared to HIV−.</p>†<p>P < 0.05, HIV+/HAART+ compared to HIV+/HAART−.</p><p>Comparisons of data represented with means were performed using t-tests for 2-group comparisons and linear regression with robust estimation of the standard errors. Comparisons of data represented by medians were performed using the Wilcoxon ranksum test for 2-group comparisons. Comparisons of categorical data represented by percent were performed using chi-square analysis and Fisher’s exact test.