The survey sample included: 1,031 learners aged 7 to 11; 1,045 learners aged 12 to 15; 651 learners aged 16 to 18 and 404 learners who did not provide their age.
Roedd sampl yr arolwg yn cynnwys y canlynol: 1,031 o ddysgwyr rhwng 7 ac 11 oed; 1,045 o ddysgwyr rhwng 12 a 15 oed; 651 o ddysgwyr rhwng 16 a 18 oed a 404 o ddysgwyr na wnaethant nodi eu hoedran.