In the coming months there are several changes planned for how performance is measured in NHS services which will affect the statistics published in this release.
Y bwriad yw cyhoeddi ystadegau ar lefel sefydliadau'r GIG mewn rhifynnau o'r datganiad hwn yn y dyfodol, pan fydd gwiriadau pellach ar ansawdd data wedi'u rhoi ar waith.