Data for maintained special schools is collected at aggregate school level and most of the data on absence by pupil characteristics is not available for pupils in these schools.
Cesglir data ar gyfer ysgolion arbennig a gynhelir ar lefel ysgolion cyfanredol ac nid yw'r rhan fwyaf o'r data ar absenoldeb yn ôl nodweddion disgyblion ar gael i ddisgyblion yn yr ysgolion hyn.