It shows that both the annual and weekly collections produce consistent results with the greatest difference for year 10 pupils at 0.4 percentage points.
Mae'n dangos bod y casgliadau blynyddol ac wythnosol ysn cynhyrchu canlyniadau cyson gyda'r gwahaniaeth mwyaf i ddisgyblion blwyddyn 10 sef 0.4 pwynt canran.