Table 3. Multivariable generalized estimating equation population-averaged model of virological suppression up to 24 months of ART (n = 10 458)^a.

Variable	Adjusted OR	95% CI	P-value
Male gender	0.89	0.80–1.00	0.051
Age: 16–19 years	0.44	0.27–0.72	0.001
20–29 yearsb	1.00
30–39 years	1.12	0.99–1.26	0.069
≥40 years	1.69	1.33–2.16	<0.001
WHO stage: I/IIb	1.00
III/IV	0.86	0.76–0.97	0.018
Baseline CD4 cell count (µL)	1.00	0.99–1.00	0.149
Western Cape provinceb	1.00
Eastern Cape province	0.41	0.32–0.52	<0.001
KwaZulu-Natal province	0.69	0.59–0.82	<0.001
Mpumalanga province	0.30	0.17–0.51	<0.001
Primary healthcare facilitiesb	1.00
District hospitals	0.76	0.59–0.97	0.030
Regional hospitals	0.64	0.56–0.75	<0.001
ART duration 6 monthsb	1.00
ART duration 12 months	0.83	0.78–0.92	<0.001
ART duration 18–24 months	0.83	0.73–0.95	0.007

^aEstimates adjusted for all variables shown and year of starting ART.

^bReference category.

WHO-World Health Organisation; CI-confidence interval; ART-antiretroviral therapy.