Respondents were asked the same series of questions, with the intention of assessing the extent to which behaviours had changed since the first wave of data collection in June 2020.
Gofynnwyd yr un gyfres o gwestiynau i'r ymatebwyr, gyda'r bwriad o asesu i ba raddau yr oedd ymddygiadau wedi newid ers y don gyntaf o gasglu data ym mis Mehefin 2020.