Yesterday, there was no way of telling as the Risk Adjusted Mortality Index, or RAMI, figures for Wales had never been published together in one place.

BBC: RAMI: Ropey And Muddled Information?

Other annual adjustments to the index make it difficult to compare mortality rates from year to year.

BBC: Wales hospital death rates: NHS 'fire alarm' warning

Peto and his colleagues in the Prospective Studies Collaboration, a team of dozens of researchers from around the world, say they did the new study to figure out exactly how body mass index (BMI) relates to mortality.

CNN: Obesity can shorten lifespan up to a decade

The Mother's Index uses indicators of maternal health and under-five mortality, as well as women's education, income and political status.

BBC: UK fails to make top 20 in mother's index