More quality and methodology information on strengths, limitations, appropriate uses, and how the data were created is available in the Socioeconomic inequalities in avoidable mortality QMI (ONS).
I gael rhagor o wybodaeth am y gwahanol ffynonellau swyddogol data presenoldeb a chyngor ar ba un dylid eu defnyddio a phryd, gweler yr adran Gwybodaeth Ansawdd a Methodoleg.