Table 3.

Transition readiness score calculation for viral suppression one year after transitioning to adult care for adolescents living with perinatally-acquired HIV

Variable	Beta	Categories	Reference value (W)	β(W-WREF)	Points = (β(W-WREF) /Bconstant)* −1
HARTS	0.05	2–20*	11	0	0
		21–30	25.5	0.73	1
		31–39	35	1.20	2
		40–56	48	1.85	4
Age at ART initiation	-0.21	0–5*	2.5	0	0
		6–8	7	-0.95	-2
		9–15	12	-2.0	-4
Regimen line	2.63	Second line	0 = ref	0	0
		First line	1	2.63	5
Sex	-0.91	Male	0 = ref	0	0
		Female	1	-0.91	-2
Disclosed	1.01	No	0 = ref	0	0
		Yes	1	1.01	2
Alcohol use	-1.23	No	0 = ref	0	0
		Yes	1	-1.23	-2
Total score range					-8 to 11

*Reference category

For HARTS B_constant we considered a 10-point increase in HARTs score (0.05*10 = 0.5)

Model (log scale) = 0.05*HARTS Score − 0.21* Age at ART initiation + 2.63*first line ART − 0.91* Female + 1.01*Documented Disclosure − 1.23*alcohol use − 1.92