Note [u]: The data item for those aged 16 to 18 who are disabled is based on between 25 and 40 responses and is categorised as being of low quality.
Nodyn [u2]: Mae'r eitem ddata ar gyfer y rhai 16 i 18 oed sy’n anabl yn seiliedig ar rhwng 25 a 39 ymateb ac wedi'i dosbarthu fel ei bod o ansawdd cyfyngedig.