Depression mediates the relationship between exposure to stigma and medication adherence among people living with HIV in low-resource setting: a structural equation modeling approach

This study hypothesizes that depression mediates the association between exposure to stigma and medication non-adherence in people living with HIV (PLHIV). We recruited 372 PLHIV from the Stigma, health-related Quality of life, antiretroviral Adherence, and Depression among people living with HIV (SQuAD-HIV) project, a multicenter cross-sectional study conducted between October 2021 and February 2022 among PLHIV attending six ART clinics in two geopolitical regions of northern Nigeria. A structural equation modeling (SEM) framework, utilizing the full information maximum likelihood estimator, was used to elucidate the pathways linking stigma, depression, and ART medication adherence, adjusting for sociodemographic characteristics. The total number of eligible participants analyzed (353) included 32.7% male PLHIV with a mean age (SD) of 39.42 (10.14). Being female was positively associated with adherence (β, 95% CI 0.335, 0.163–0.523, p-value < 0.001) but negatively associated with stigma (β, 95% CI − 0.334, − 0.561 to − 0.142, p-value = 0.001), while urban residence was negatively associated with stigma (β, 95% CI − 0.564, − 0.804 to − 0.340, p-value < 0.001). Our analysis also indicated that a higher level of experienced stigma was associated with decreased medication adherence. This association was partially mediated by depression (indirect effect = (0.256) (− 0.541) =  − 0.139; p-value < 0.01). The proportion of the association between stigma and medication adherence explained through mediation by depression was 35.6%. These findings underscore the need for targeted interventions aimed at lowering exposure to stigma among PLHIV to improve medication adherence.