Ethnicity categorization in health research: Implications for mental health service delivery in Aotearoa New Zealand

Current ethnicity categorization practices in Aotearoa New Zealand's health system may perpetuate health inequities. Prioritized ethnicity data obscures social realities and fails to capture mixed ethnic identity complexity. Waikato Hospital admission and regional suicide data reveal significant health outcome variations within ethnic groups, particularly among Māori populations. Those identifying solely as Māori show higher hospital admission rates and suicide risk compared to mixed Māori-European identity individuals. Collapsing diverse ethnic categories masks important disparities and leads to inappropriate resource allocation. Mental health services require sophisticated approaches to ethnicity data that recognize cultural identity complexity and enable targeted interventions.