Income Inequality Is Associated With Low Cumulative Antiretroviral Adherence in Persons With Human Immunodeficiency Virus. (29th August 2020)

• Record Type: Journal Article
• Authors: Vernon, Frances; Morrow, Mary; MaWhinney, Samantha; Coyle, Ryan; Coleman, Stacey; Ellison, Lucas; Zheng, Jia-Hua; Bushman, Lane; Kiser, Jennifer J; Galárraga, Omar; Anderson, Peter L; Castillo-Mancilla, Jose
• Is Part Of: Open forum infectious diseases. Volume 7:Number 10(2020)
• Publication Date: 2020-08-29
• Subjects: adherence -- dried blood spots -- income inequality -- social determinants of health -- tenofovir diphosphate; Communicable diseases -- Periodicals; Medical microbiology -- Periodicals; Infection -- Periodicals; 616.9
• DOI: 10.1093/ofid/ofaa391
• Languages: English
• ISSNs: 2328-8957

Abstract

Abstract: Background: The adherence biomarker tenofovir diphosphate (TFV-DP) in dried blood spots (DBS) is associated with viral suppression and predicts future viremia. However, its association with social determinants of health (SDoH) in people with human immunodeficiency virus (PWH) remains unknown. Methods: Dried blood spots for TFV-DP were longitudinally collected from a clinical cohort of PWH receiving tenofovir disoproxil fumarate-based therapy (up to 3 visits over 48 weeks) residing in 5 Colorado counties. To assign SDoH, zip codes at enrollment were matched with SDoH data from AIDSVu (https://aidsvu.org/ ). The SDoH included household income, percentage living in poverty, education level, and income inequality (quantified using Gini coefficient, where 0 and 1 represent perfect income equality and inequality, respectively). Log-transformed TFV-DP concentrations were analyzed using a mixed-effects model to estimate percentage change (95% confidence interval) in TFV-DP for every significant change in the SDoH and adjusted for relevant covariates including age, gender, race, estimated glomerular filtration rate, body mass index, hematocrit, CD4 + T-cell count, antiretroviral drug class, and 3-month self-reported adherence. Results: Data from 430 PWH totaling 950 person-visits were analyzed. In an adjusted analysis, income inequality was inversely associated with TFV-DP in DBS. For every 0.1 increase in the Gini coefficient, TFV-DP concentrations decreased by 9.2% (−0.5 to −17.1; P = .039). This remained significant after adjusting for human immunodeficiency virus viral suppression, where a 0.1 increase in Gini was associated with a decrease of 8.7% (−0.3 to −17.9; P = .042) in TFV-DP. Conclusions: Higher income inequality was associated with lower cumulative antiretroviral adherence. These findings support the need for further research on how SDoH impact adherence and clinical care. Abstract : Higher income inequality, measured using the Gini coefficient, was associated with lower cumulative antiretroviral adherence in PWH taking tenofovir-based antiretroviral therapy. This emphasizes the influence that population-based social determinants of health have in clinical outcomes.