Grant Robinson, medical director for Aneurin Bevan Local Health Board, said the inconsistencies in coding made it difficult to turn the index into a league table.

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

This pivotal round of funding was led by Bo Axel Ax:son Johnson, a private investor whose company, Coding Technologies was sold to Dolby, and Nils-Robert Persson, executive chairman of the board for Cinnober Financial Technology, the Sweden-based provider of electronic trading platforms.

FORBES: The Rise of the Knowledge Market