GAD2 and Cognitive impairment: One-way analysis of variance (ANOVA) yielded F = 5.294 and p = 0.0015 for GAD1, F = 6.688 and p = 0.0002 for GAD2, and F = 7.215 and p = 0.0001 for GJD2. Groups of HIV-positives with different degrees of cognitive impairment did not differ from each other.