[Note 2] Hywel Dda and Aneurin Bevan did not provide correctly recorded data for this data item so have been excluded from the analysis.
[Nodyn 2] Ni ddarparodd byrddau iechyd Hywel Dda ac Aneurin Bevan gofnodion data cywir ar gyfer yr eitem ddata hon, felly maent wedi’u hepgor o’r dadansoddiad.