Medication side effects and retention in HIV treatment: A regression discontinuity study of tenofovir implementation in South Africa and Zambia

Brennan, A.T., Bor, J., Davies, M.-A. , Wandeler, G., Prozesky, H., Fatti, G., Wood, R., Stinson, K., Tanser, F., Bärnighausen, T., Boulle, A., Sikazwe, I., Zanolini, A. and Fox, M.P. (2018) Medication side effects and retention in HIV treatment: A regression discontinuity study of tenofovir implementation in South Africa and Zambia. American Journal of Epidemiology, 187 (9). pp. 1990-2001. ISSN 0002-9262

Full content URL: https://doi.org/10.1093/aje/kwy093

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Item Type:Article
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Abstract

Tenofovir is less toxic than other nucleoside reverse-transcriptase inhibitors used in antiretroviral therapy (ART) and may improve retention of human immunodeficiency virus (HIV)–infected patients on ART. We assessed the impact of national guideline changes in South Africa (2010) and Zambia (2007) recommending tenofovir for first-line ART. We applied regression discontinuity in a prospective cohort study of 52,294 HIV-infected adults initiating first-line ART within 12 months (±12 months) of each guideline change. We compared outcomes in patients presenting just before and after the guideline changes using local linear regression and estimated intention-to-treat effects on initiation of tenofovir, retention in care, and other treatment outcomes at 24 months. We assessed complier causal effects among patients starting tenofovir. The new guidelines increased the percentages of patients initiating tenofovir in South Africa (risk difference (RD) = 81 percentage points, 95% confidence interval (CI): 73, 89) and Zambia (RD = 42 percentage points, 95% CI: 38, 45). With the guideline change, the percentage of single-drug substitutions decreased substantially in South Africa (RD = −15 percentage points, 95% CI: −18, −12). Starting tenofovir also reduced attrition in Zambia (intent-to-treat RD = −1.8% (95% CI: −3.5, −0.1); complier relative risk = 0.74) but not in South Africa (RD = −0.9% (95% CI: −5.9, 4.1); complier relative risk = 0.94). These results highlight the importance of reducing side effects for increasing retention in care, as well as the differences in population impact of policies with heterogeneous treatment effects implemented in different contexts.

Additional Information:cited By 3
Divisions:College of Social Science > Lincoln Institute of Health
ID Code:37585
Deposited On:09 Oct 2019 15:39

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