Pupils entitled to free school meals have been less likely to attend school, with the gap being an average of 4.5 percentage points between 13 to 17 June.
Mae disgyblion sydd â hawl i brydau ysgol am ddim wedi bod yn llai tebygol o fynychu’r ysgol, gyda’r bwlch ar gyfartaledd yn 4.5 pwynt canran rhwng 13 i 17 Mehefin 2022.