Figure 2.

Estimated longitudinal profiles (posterior mean) of CD4 cell count for patients who had low baseline HIV viral load (0–500 copies ml⁻¹), one HIV symptom and were taking antiretroviral therapy at baseline in the HERS: ∘, unconditional mean profile of CD4 cell count from the LMM analysis $(E(Y_{ij}|{\mathbf{x}}_{ij})={\mathbf{x}}_{ij}^{\mathrm{T}}\mathit{\beta })$; ▵, unconditional mean profile of CD cell count from the JM analysis $(E(Y_{ij}|{\mathbf{x}}_{ij})={\mathbf{x}}_{ij}^{\mathrm{T}}\mathit{\beta })$; ⋄, partly conditional mean profile given that the patients were still alive at the current visit $(E(Y_{ij}|{\mathbf{x}}_{ij},S_i⩾j))$