However, in some studies, the effects of age, education and marital status were not significant.25 60 Other correlates of cognitive impairment included the presence of depressive symptoms,60 a history of cardiovascular conditions53 and a history of falls in the past 12 months.33 HIV specific factors (such as nadir CD4 count, ART use)25 61 and vascular risk factors (such as smoking status, body mass index and blood pressure)25 were not associated with cognitive impairment. Here, CD4 is linked to Cognitive impairment.