The number of patients starting treatment within the target time is also likely to have been affected by the period when some patients were shielding and by patient choices.
Mae’n debyg y bydd y cyfnodau pan oedd rhai cleifion yn gwarchod eu hunain a dewisiadau cleifion hefyd yn effeithio ar nifer y cleifion sy’n dechrau cael triniaeth o fewn yr amser targed.