Accuracy of ethnicity records at primary and secondary healthcare services in Waikato region, Aotearoa New Zealand.

Aims: Ethnicity is an important variable, and in Aotearoa New Zealand it is used to monitor population health needs, health services outcomes and to allocate resources. However, there is a history of undercounting Māori. The aim of this study was to compare national and primary care ethnicity data to self-reported ethnicity from a Kaupapa Māori research cohort in the Waikato region.