Caution is advised when making comparisons between Waves 11 to 13 (which include data collected between 2020 and 2022) and prior waves.
Cynghorir defnyddio pwyll wrth wneud cymariaethau rhwng Tonnau 11 i 13 (sy’n cynnwys data a gasglwyd rhwng 2020 a 2022) a thonnau blaenorol.