There are modest differences in the 70-79 year olds, 60-69 year olds, 30-39 year olds and 0-9 year olds as well.
Mae gwahaniaethau cymedrol o ran pobl 70-79 oed, pobl 60-69 oed, pobl 30-39 oed a phlant 0-9 oed hefyd.