The median interview length for the sample receiving the full questionnaire was 47.0 minutes (excluding anomalies and outlier cases), two minutes longer than the expected interview length.
Cymharwyd y newidynnau, a lle’r oedd gwahaniaeth o 2 bwynt canran neu fwy rhwng proffil y cyfweliad a gafwyd a phroffil y sampl, defnyddiwyd pwysoliad heb ymateb.