It was found that some age groups were either slightly over or under-represented in the sample response, therefore weighting has been applied on age to make the results representative.
Nodwyd bod rhai grwpiau oedran naill ai'n cael eu gorgynrychioli neu eu tangynrychioli yn yr ymateb sampl, felly mae'r canlyniadau wedi cael eu pwysoli yn ôl oedran i'w gwneud yn gynrychioladol.