The study compared health equity in New Zealand and the United States, stating that both countries had poor health equity.

But the prime minister compared health services in England, run by the coalition, and the record of Labour-run services in Wales.

It compared health outcomes between people in different socio-economic groups as well as those living in different geographic area of the State.

A 2004 article in the British Medical Journal (BMJ) compared health outcomes to a "freedom index" calculated by an independent watchdog.

Objectives: This study compared health service use and satisfaction with health care among older adults living in urban vs rural counties in North Carolina.

Hussey and his colleagues analyzed results from 61 studies that compared health care spending with outcomes on both small, hospital-wide scales and broader state-wide levels.