Table 2.

Results of linear spline model of square root of CD4⁺ cell count over time around antiretroviral therapy initiation (N = 1155 observations).

Parameter	Value (95% CI)	SE	P value
Days pre-ART	−0.02 (−0.04 to 0.00)	0.01	0.08
0–84 days post-ART	0.13 (0.09–0.17)	0.02	<0.01
>84 days post-ART	−0.11 (−0.15 to −0.08)	0.02	<0.1
Age at ART initiation (years)	−0.54 (−0.84 to −0.25)	0.15	<0.01
Interaction of days pre-ART with age at ART initiation	0.00 (−0.00 to 0.00)	0.00	0.74
Interaction of 0–84 days post-ART with age at ART initiation	−0.01 (−0.01 to −0.00)	0.00	0.01
Interaction of >84 days post-ART with age at ART initiation	0.00 (0.00–0.01)	0.00	0.01
Intercept	22.38 (18.97–25.79)	1.74	<0.01

ART, antiretroviral therapy; CI, confidence interval.