This difference is even more pronounced for 19 to 24 year olds compared to 16 to 18 year olds.
Mae’r gwahaniaeth o ran argaeledd data ar gyfer y rhai 19 i 24 oed o gymharu â’r rhai 11 i 18 oed wedi arwain at benderfyniad i’r canllawiau YEPF diwygiedig ganolbwyntio ar yr ail grŵp.