You raised this yesterday with the First Minister, of course, and he made clear that the figures take no account of age, deprivation or ill health. I'll refer you back to his comments: 

'Now, the particular measure reported involved small numbers and it's consequently not age adjusted. Age is likely to be the main reason why this figure seems high, not least reflecting that Conwy has the highest percentage of over 75s in the whole of Wales. 

'More recent figures from the health board show some reduction in the peak reported. The overall in-hospital mortality rates for Ysbyty Glan Clwyd are in line with the Welsh average.'