Ym mis Gorffennaf 2014, cyhoeddwyd adolygiad yr Athro Stephen Palmer o ddefnyddio data marwolaethau wedi’i addasu yn ôl risg yn GIG Cymru. Daeth i'r casgliad nad oedd mynegai marwolaethau wedi'i addasu yn ôl risg (RAMI) yn ffordd ystyrlon o fesur ansawdd ysbyty, ac y gallai defnydd ohono dynnu sylw oddi ar ddulliau eraill mwy ystyrlon o fesur a gwella gofal mewn ysbytai.
In July 2014, Professor Stephen Palmer’s review of the use of risk-adjusted mortality data in NHS Wales was published. He concluded the risk-adjusted mortality index (RAMI) was not a meaningful measure of hospital quality in Wales and its use could divert attention away from more meaningful approaches to measuring and improving hospital care.