Uses two large UK population-based longitudinal studies (Medical Research Council Cognitive Function and Ageing Study [MRC CFAS] I, 1989–2008; CFAS II, 2008–2016) to validate dementia death-certificate recording against gold-standard study diagnoses in 3,236 individuals interviewed in their last year of life. Finds that dementia recording on death certificates has improved dramatically over 26 years — from 5.3% to 25.9% of deaths — but sensitivity remains below 50% even in the most recent period. Conclusion: routine death-certificate surveillance substantially underestimates dementia mortality and must be supplemented with epidemiological prevalence estimates.
"Recording dementia on death certificate has improved significantly in England and Wales. However, such information is still an underestimate and should be used alongside epidemiological estimations."
A clean methodological calibration paper. The key result — that sensitivity roughly doubled from 21% to 45% over two decades, driven by policy changes and heightened dementia awareness — is important for any study using death-certificate dementia statistics as an outcome or exposure. It implies that apparent upward trends in dementia mortality partly reflect improved recording rather than true incidence changes; and that comparisons across time, settings, or countries need to account for this artefact. For the wiki, the main relevance is as a complement to the US-focused death certificate quality papers (Arias et al. 2008 on race/ethnicity; Howard et al. 2014 on disease-specific disparities; Meseguer 2024 on cause-specific mortality trends by race): all share the theme that vital statistics require methodological scrutiny before being used for trend analysis.