Subgroup	Size	Coefficient estimate (p-value)
subgroup characteristics	Size	Intercept ( $β_{0}$ )	Other ART ( $β_{1}$ )	Previous visit index ( $β_{2}$ )
Female and baseline CD4 ≤ 73	592	12.238 (0.000)	−0.159 (0.543)	1.026 (0.000)
Male and baseline CD4 ≤ 73	346	11.280 (0.000)	−0.551 (0.088)	0.818 (0.000)
Age ≤ 34 & 73 < baseline CD4 ≤ 129	381	15.008 (0.000)	0.037 (0.926)	0.864 (0.000)
Age > 34 and 73 < baseline CD4 ≤ 129	422	13.952 (0.000)	−1.945 (0.000)	0.792 (0.000)
Age ≤ 34 and 129 < baseline CD4 ≤ 225	634	17.470 (0.000)	−2.491 (0.000)	0.860 (0.000)
Age > 34 and 129 < baseline CD4 ≤ 225	707	16.321 (0.000)	−1.387 (0.000)	0.820 (0.000)
Baseline CD4 > 225	377	19.653 (0.000)	−0.134 (0.687)	0.611 (0.000)
Residual variance: ${\hat{σ}}^{2} = 8.204$
Random effect variance: ${\hat{σ}}_{b}^{2} = 10.908$