Te rāranga me te tātau - Weaving indigenous statistical patterns in Aotearoa New Zealand

From 1840 to 2026, health data standards and policies for the Indigenous people of Aotearoa New Zealand grew with the evolution of statistics, stimulated by Indigenous knowledge. This paper traces that evolution and considers its implications for improving the quality of Indigenous health data. The rise of health data and changes in statistical classification standards saw metrics characterising Māori, New Zealand's Indigenous people, change over time. Aotearoa New Zealand's statistical methodology increasingly incorporated Māori culture, language, and values, resulting in the refinement of protocols for collecting, analysing, and using new sources of data to support improved health measurement. Recent advances include combining data linkage with administrative datasets and census information to address long-standing statistical gaps and support culturally responsive health services. Aotearoa-New Zealand is also transitioning from a population census toward an administrative–data–based system designed to improve data interoperability, adequacy, and coordination across public and private sectors. These shifts reflect incremental acknowledgement of Māori treaty-based rights, improved Māori data quality and acknowledgement of breaches of treaty-based (Te Tīriti) rights. These shifts reposition data as a tool for equity from a source of systemic bias. Ultimately, the Indigenous data strategies employed to improve Māori health data illustrate episodes of the Indigenous Data Sovereignty and the application of Indigenous Data Governance, illuminating a pathway for transforming health data to support a society-wide foundation for fair resource allocation and improve well–being for Indigenous communities.