Baseline CD4 count, hepatitis B status, race, smoking status, AIDS ever or in the 12 mo prior to baseline, prior use of other antiretrovirals (including abacavir or indinavir), anaemia, and viral load (as either a continuous or categorical variable) were not significantly related to CKD after adjustment for the other variables listed and were excluded from our risk score models. Here, CD4 is linked to anemia.