Demographic and clinical characteristics^a.

a<p>Values are expressed as No. (%) or median (interquartile range).</p>b<p>Standardized T scores based on normative data.</p>c<p>Previous or current disease involving the CNS, psychiatric disorder, psychopharmacologic treatment, and drug use.</p><p>Abbreviations: MSM, men who have sex with men; CDC, Centers for Disease Control and Prevention; ARV, antiretroviral; PIs, protease inhibitors; NRTIs, nucleoside reverse transcriptase inhibitors; NNRTIs, nonnucleoside reverse transcriptase inhibitors; LPV/r, lopinavir/ritonavir; LPV/r-MT, lopinavir/ritonavir monotherapy; LPV/r-ART, lopinavir/ritonavir triple-therapy; TDF, tenofovir; FTC, emtricitabine; ABC, abacavir, 3TC, lamivudine; AZT, zidovudine; ddI, didanosine; VL, viral load; WAIS-III, Wechsler Adult Intelligence Scale-III; Beck Depression Inventory; STAI, State-Trait Anxiety Inventory.</p