Belief improvements are being made in the health system, but they don't show the full story.

Quarterly data shows improvements around cancer treatment access, childhood immunisation rates, ED stays, and wait times.

Health Minister Simeon Brown says it shows the system is turning a corner. 

Former Health NZ Chair Rob Campbell told Ryan Bridge there are inconsistencies in how targets are measured, such as when ED wait times begin.

He says information is often structured to meet targets in the health service and other organisations.

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