Social determinants and inequitable maternal and perinatal outcomes in Aotearoa New Zealand.

OBJECTIVES: Aotearoa New Zealand has demonstrable maternal and perinatal health inequity. We examined the relationships between adverse outcomes in a total population sample of births and a range of social determinant variables representing barriers to equity. METHODS: Using the Statistics New Zealand Integrated Data Infrastructure suite of linked administrative data sets, adverse maternal and perinatal outcomes (mortality and severe morbidity) were linked to socio-economic and health variables for 97% of births in New Zealand between 2003 and 2018 (~970,000 births). Variables included housing, economic, health, crime and family circumstances. Logistic regression examined the relationships between adverse outcomes and social determinants, adjusting for demographics (socio-economic deprivation, education, parity, age, rural/urban residence and ethnicity). RESULTS: Maori (adjusted odds ratio = 1.21, 95% confidence interval = 1.18-1.23) and Asian women (adjusted odds ratio 1.39, 95% confidence interval = 1.36-1.43) had poorer maternal or perinatal outcomes compared to New Zealand European/European women. High use of emergency department (adjusted odds ratio = 2.68, 95% confidence interval = 2.53-2.84), disability (adjusted odds ratio = 1.98, 95% confidence interval = 1.83-2.14) and lack of engagement with maternity care (adjusted odds ratio = 1.89, 95% confidence interval = 1.84-1.95) had the strongest relationship with poor outcomes. CONCLUSION: Maternal health inequity was strongly associated with a range of socio-economic and health determinants. While some of these factors can be targeted for interventions, the study highlights larger structural and systemic issues that affect maternal and perinatal health.

Do maternity services in New Zealand's public healthcare system deliver on equity? Findings from structural equation modelling of national maternal satisfaction survey data.

BACKGROUND: Birthing outcomes in New Zealand are demonstrably inequitable based on governmental reports and research. However, the last Ministry of Health maternal satisfaction survey in 2014 indicated that 77% of women were satisfied or very satisfied with care. This study used data from the maternal satisfaction survey to examine aspects of inequity in reported satisfaction with care. METHODS: Structural Equation Modelling (SEM) was used to infer latent variables of satisfaction with equity domains from responses to the satisfaction survey. Additional data (residential location and deprivation score), not used in the Ministry of Health primary analysis, were provided and included in this modelling. RESULTS: SEM showed that satisfaction was not equitably distributed. Younger women, those from areas of high socio-economic deprivation, and remote rural women were most likely to be affected by dissatisfaction associated with physical access, cultural care, information provided, and/or barriers to equity associated with additional costs (all p<0.05). Financial burden of additional costs was also unevenly distributed. CONCLUSION: While these findings are congruent with other research on the association between social determinants and maternal satisfaction, it is concerning that they remain sources of inequity in New Zealand twenty years after they were first identified as priorities to address. On the basis of this study, urgent attention needs to be paid to removing sources of inequity within the health system and maternity care in particular.

Barriers to equitable maternal health in Aotearoa New Zealand: an integrative review.

BACKGROUND: The purpose of this review was to examine the literature for themes of underlying social contributors to inequity in maternal health outcomes and experiences in the high resource setting of Aotearoa New Zealand. These 'causes of the causes' were explored and compared with the international context to identify similarities and New Zealand-specific differences. METHOD: A structured integrative review methodology was employed to enable a complex cross disciplinary analysis of data from a variety of published sources. This method enabled incorporation of diverse research methodologies and theoretical approaches found in the literature to form a unified overall of the topic. RESULTS: Six integrated factors - Physical Access, Political Context, Maternity Care System, Acceptability, Colonialism, and Cultural factors - were identified as barriers to equitable maternal health in Aotearoa New Zealand. The structure of the maternal health system in New Zealand, which includes free maternity care and a woman centred continuity of care structure, should help to ameliorate inequity in maternal health and yet does not appear to. A complex set of underlying structural and systemic factors, such as institutionalised racism, serve to act as barriers to equitable maternity outcomes and experiences. Initiatives that appear to be working are adapted to the local context and involve self-determination in research, clinical outreach and community programmes. CONCLUSIONS: The combination of six social determinants identified in this review that contribute to maternal health inequity is specific to New Zealand, although individually these factors can be identified elsewhere; this creates a unique set of challenges in addressing inequity. Due to the specific social determinants in Aotearoa New Zealand, localised solutions have potential to further maternal health equity.