For some indicators we have used alternative, but similar, measures from other sources (for example on mental wellbeing or the school sports survey).
Ar gyfer rhai dangosyddion rydym wedi defnyddio mesurau gwahanol, ond tebyg, o ffynonellau eraill (er enghraifft llesiant meddyliol neu arolwg chwaraeon ysgolion).