Association between the quality of care and continuous maternal and child health service utilisation in Angola: Longitudinal data analysis.

Background: Many low- and middle-income countries (LMICs) prioritise minimising maternal, neonatal, and infant mortality. To improve maternal and child health, various evidence-based interventions have been introduced. Quality of care is pertinent while strengthening service utilisations. Achieving optimal-quality care is often marred with difficulties, such as inadequate skills and knowledge of health workers, poor fidelity to protocols, and poor user acceptance. Angola is a LMIC facing these problems. This study aimed to demonstrate the influence of health facilities' quality of care at antenatal care (ANC) on subsequent maternal, newborn and child health (MNCH) service utilisation in Angolan pregnant women. Methods: Population-based cohort data from the Maternal and Child Health Handbook (MCH-HB) effectiveness study were analysed. The original study was conducted among women who became pregnant between March and April 2019 in Benguela Province, Angola. Socioeconomic and MNCH service utilisation indicators were collected through interviewer-administered structured questionnaires. The indicator of quality of care was a composite measure that assessed the implementation of the MCH-HB based on the RE-AIM framework, mostly consisted of common factors related to delivery and management of MNCH services. A multivariate logistic regression analysis was performed between quality of care, socioeconomic factors, and service utilisation indicators among the intervention group participants who had at least one ANC visit. Results: Of the 3351 pregnant women who visited ANC at least once, 2911 without missing values among explanatory or dependent variables were included in the analysis. Among them, 2032 (69.8%) were exposed to optimal-quality ANC, and 2058 (70.7%), 1573 (54.0%), and 941 (32.3%) achieved ANC target, facility delivery, and vaccination target for six-month-old infants, respectively. Exposure to suboptimal-quality care at ANC was associated with lower odds for facility delivery (adjusted odds ratio (AOR) = 0.60, 95% CI = 0.49-0.73) and the achievement of the vaccination target (AOR = 0.43, 95% CI = 0.33-0.55). A low socioeconomic status was inversely associated with health service utilisation indicators. Conclusions: Health facilities' quality of care influences subsequent MNCH service utilisation. Therefore, simultaneous efforts to improve quality of care and the mobilisation of pregnant women and communities are essential for enhancing maternal and child health.