Figure 1. Predicted CD4 count by time on ART.

Predicted values are based on the multivariable linear regression model y = α+β₁t+β₂t+β₃t+β₄t, where the independent variable, y, is CD4 count; the dependent variable, t, is time on ART, the y-intercept, α, is CD4 count at t = 0, and β₁–β₄ are respective β-coefficients for the co-variables age, TB co-infection, deworming, and deworming*time interaction.