People with National Qualifications of level 4 or higher had bought or received second-hand items more than the national average, with 75%.
Roedd pobl â Chymwysterau Cenedlaethol ar Lefel 4 neu uwch wedi prynu neu dderbyn eitemau ail-law yn fwy na'r cyfartaledd cenedlaethol, gyda 75% wedi gwneud hynny.