People in Germany who have received a formal dementia diagnosis die at substantially higher rates than people of the same age without the diagnosis, and the gap is widest among the youngest patients studied. A nationwide analysis covering the years 2016 to 2021 found that women diagnosed with dementia at age 65 faced up to eleven times the risk of death of women without dementia at the same age, while the corresponding figure for men was up to nine times. The relative excess shrank steadily with advancing age, becoming almost negligible by age 95, when mortality is high for everyone regardless of diagnosis.
The study, published in Alzheimer’s Research & Therapy, drew on outpatient claims data from Germany’s statutory health insurance system, which covered roughly 73 million people in 2022, about 88 percent of the total population. The researchers combined annual age- and sex-specific incidence and prevalence figures for diagnosed dementia among people aged 65 and older with general-population mortality data from the German Federal Statistical Office. Using a partial differential equation rooted in an illness-death model, they estimated mortality rates for people with diagnosed dementia and mortality rate ratios comparing them with people without the diagnosis, for every single age from 65 to 100.
A central methodological choice shapes how the results should be read. Because determining whether dementia itself caused a death is clinically difficult, deaths among people with dementia often arise from complications or coexisting conditions rather than dementia recorded as the underlying cause, the authors estimated all-cause mortality among individuals with a documented diagnosis. Their term “mortality of people with dementia” therefore refers to deaths occurring in people who had been diagnosed, not deaths attributed to dementia. A dementia case was counted only when a relevant ICD-10-GM diagnosis code appeared in at least two quarters within four consecutive quarters, a definition intended to reduce misclassification.
The headline numbers show a modest but consistent rise over the study window. Age-standardized mortality among people with diagnosed dementia increased from 18,845 to 20,238 per 100,000 between 2016 and 2021, a rise of 7.4 percent. Broken down by sex, the standardized rate climbed from 18,730 to 20,135 per 100,000 for women, an increase of 7.5 percent, and from 19,222 to 20,909 per 100,000 for men, an increase of 8.8 percent. The overall rate rose steadily from 2016 to 2020 before dipping slightly between 2020 and 2021, and men typically showed higher mortality than women throughout.
Age dominated the mortality pattern. Mortality rates increased exponentially with age, yet remained relatively stable across the six study years, with only a slight upward trend. At age 65, women with diagnosed dementia had estimated mortality rates of roughly 7,000 to 8,500 per 100,000, while the range for men ran from about 7,000 to 11,000 per 100,000. By age 85, average rates had reached about 16,000 per 100,000 for women and 21,000 per 100,000 for men. Among people over 100, the figures climbed to roughly 50,000 to 60,000 per 100,000 for women and 70,000 to 80,000 per 100,000 for men.
The mortality rate ratios tell a more striking story about relative risk. At age 65, women with dementia were approximately 8 to 11 times more likely to die than women without dementia, and men with dementia faced a 6 to 9 times greater risk than their non-diagnosed peers. The disparity was most pronounced in the 65-to-70 age group and diminished progressively with age, showing minimal differences by age 95. From age 75 onward, the ratios for both sexes increased over the study period, while among those younger than 75 the ratios varied over time with no clear trend, though women in that younger range consistently showed higher ratios than men.
The authors offer two main explanations for the steep age gradient in relative risk. First, people of the same young age in the general population tend to have fewer comorbidities, so a dementia diagnosis marks a sharper departure from the baseline risk of their peers. As population aging drives up mortality overall and comorbidities accumulate among the oldest groups, dementia becomes one of several competing health problems, and the relative excess narrows. Second, diagnostic and care patterns may inflate the apparent risk at younger ages: dementia in younger patients is often undiagnosed or misdiagnosed and documented only after a lengthy differential diagnostic process or once it has advanced, so routine data may predominantly capture moderate to severe cases while very mild ones are underrepresented, potentially overestimating relative mortality. The authors also note that excess mortality associated with dementia cannot be explained by comorbidity burden alone.
The COVID-19 pandemic complicates interpretation of the year-to-year trends. The pandemic may have affected dementia diagnosis and healthcare utilization in 2020, influencing the ascertainment of incidence and prevalence on which the mortality estimates depend. People with dementia also carry a high underlying risk of all-cause mortality, and COVID-19 may have displaced some deaths forward in time among particularly vulnerable individuals, potentially attenuating the observed increase within a single calendar year. Because the standardized rates used a fixed 2015 age distribution as weights, changes concentrated in heavily weighted age groups could have influenced the standardized figures more than changes elsewhere.
The findings connect to a broader and somewhat puzzling epidemiological picture in Germany. A recent claims-based study found that, despite an aging population, the incidence and prevalence of diagnosed dementia documented in German primary care practices declined by 26 percent and 18 percent respectively, though the reasons remain unclear. In that context, the researchers calculated a mortality-to-incidence ratio, which stayed consistently above 10 throughout the study period and rose continuously, with higher values in men than women. For a chronic, irreversible condition, a ratio above 1 indicates that deaths among existing cases exceed new diagnoses, which is consistent with declining prevalence. The authors caution that it is unknown whether the documented decline reflects a true epidemiological reduction in dementia burden or shifts in how physicians diagnose dementia in outpatient care.
The study has clear limitations alongside its strengths. Its data covered only people insured through statutory health insurance, so the results may not generalize to the roughly 11 percent of the German population with private insurance. Undiagnosed dementia was not captured, misclassification under the ICD-10-GM coding definition cannot be excluded, and changes in the degree of misclassification over time may have affected the reported measures. The model also assumes everyone starts life in the healthy state, an assumption the authors consider reasonable for dementia. On the strength side, the claims data span all German statutory health insurance funds, and prevalence and incidence derive from the same data-generating process, allowing mortality estimation for every age from 65 to 100. The authors conclude that a dementia diagnosis is associated with increased mortality across all age groups, particularly among younger individuals, and argue that targeted efforts to prevent dementia, delay its onset, and prolong its milder stages remain essential to reducing deaths among those affected.
Subject of Research: All-cause mortality and mortality rate ratios among people with diagnosed dementia in Germany from 2016 to 2021
Article Title: Mortality of people with diagnosed dementia in Germany between 2016 and 2021
Article References: Baginski, K., Landwehr, S., Akmatov, M. K., Kohring, C., Bohlken, J., Teipel, S., Michalowsky, B., Müller, D., Hornberg, C., Hoyer, A., & Holstiege, J. (2026). Mortality of people with diagnosed dementia in Germany between 2016 and 2021. Alzheimer’s Research & Therapy, 18(1), Article 233. https://doi.org/10.1186/s13195-026-02229-8
Image Credits: AI Generated
DOI: 10.1186/s13195-026-02229-8
Keywords: dementia, mortality, Germany, statutory health insurance, mortality rate ratio, epidemiology, aging, claims data, Alzheimer’s disease, COVID-19, prevalence, incidence
