See the Quality and Methodology section of the Marriages in England and Wales, 2016 report (ONS), and the Marriages in England and Wales QMI (ONS) for more information.
Gweler adran Ansawdd a Methodoleg y datganiad Priodasau yng Nghymru a Lloegr, 2016 (SYG) a Gwybodaeth am Ansawdd a Methodoleg o ran Priodasau yng Nghymru a Lloegr (SYG) i gael rhagor o wybodaeth.