Between-and within-socioeconomic groups temporal inequality in the uptake of malaria prevention strategies among pregnant women and under-five children in Ghana (2003-2022).

Abstract

Background: Malaria remains a leading cause of morbidity and mortality among pregnant women and children under five in sub-Saharan Africa. Despite over two decades of efforts including insecticide-treated net (ITN) distribution and intermittent preventive treatment in pregnancy (IPTp), universal and equitable coverage has not been achieved. In Ghana, coverage disparities persist, particularly along socioeconomic and geographic lines. This study investigates temporal trends and decomposes both within-group and between-group socioeconomic inequalities in ITN use and IPTp coverage among children and pregnant women in Ghana.

Methods: This study analysed nationally representative data from the Ghana Demographic and Health Surveys (2003, 2008, 2014, and 2022), focusing on ITN use among pregnant women and children under five, and IPTp uptake. Inequality was assessed using the Erreygers normalized concentration index (ENCI) and the Theil index (GE 2). Theil indices were then decomposed to quantify within- and between-group contributions by socioeconomic status (SES) and residence (urban versus. rural).

Results: ITN use among under-five children increased modestly from 58.1% (2003) to 62.9% (2022); among pregnant women, usage fluctuated but returned to 60% in 2022. IPTp coverage rose markedly from 0.85% (2003) to 60% (2022). ENCI values showed that ITN use was consistently pro-poor, becoming more concentrated among the poor over time (e.g., ENCI for pregnant women: - 0.04 in 2003 to - 0.32 in 2022). In contrast, IPTp coverage shifted to a pro-rich distribution from 2008 onwards. Theil decomposition revealed that most observed inequalities were driven by within-group disparities (e.g., within SES or residence categories), though between-group inequality increased over time particularly for IPTp. For example, in 2022, 85% of ITN inequality among pregnant women was within SES groups, while 18% was attributable to between-group differences.

Conclusion: Despite overall improvements in malaria prevention uptake, substantial socioeconomic inequalities persist especially within social and geographic subgroups. Equity-focused strategies must complement national-level efforts by addressing barriers specific to underserved populations, including informal urban settlements and remote rural communities. Policymakers must prioritize targeted, locally responsive interventions to reduce both within- and between-group disparities and achieve Ghana's malaria elimination and health equity goals.