[ 3 ] For absences opened by month, absences that were closed (but not opened) within the academic year have been excluded.
[ 3 ] Ar gyfer absenoldebau wedi’u hagor yn ôl mis, nid yw absenoldebau wedi’u cau (ond heb eu hagor) yn ystod y flwyddyn academaidd wedi’u cynnwys.