CD4 and Pallister-Hall syndrome: In the univariate analysis (Tables 1, 2), the PHS was significantly higher in participants who were younger (p = 0.036), had better education (p = 0.005), had fewer symptoms of HIV (p < 0.001), had a CD4 level >500cells/mm3 (p = 0.004), had a viral load <10,000 copies/ml, did not use methadone (p = 0.001) and had a BMI between 18.5 and 27.9 (p < 0.001).