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Researchers used a 1972 school-leaving-age reform in England, Scotland and Wales to study the long-term effects of an extra year of education. Participants required to stay in school longer were less likely to receive a dementia diagnosis by age 65, including those with high genetic susceptibility. The size and durability of the effect remain uncertain.
A 1972 school-leaving reform that required some teenagers in England, Scotland and Wales to remain in education for an extra year was linked to fewer dementia diagnoses decades later, including among people with high genetic susceptibility, according to a study published in Proceedings of the National Academy of Sciences. The findings offer evidence that education may influence dementia risk, although researchers say the size and lasting effect of the reduction are not yet clear.
Researchers from the University of Southern California, the University of Wisconsin–Madison and the University of Michigan examined the change that raised the minimum school-leaving age from 15 to 16. The rule applied to students born on or after September 1, 1957; those born just before that date could still leave school at 15. The reform increased by 14 percentage points the share of students who remained in school until at least age 16.
That cutoff gave the team a way to compare people born close together in time but subject to different schooling requirements. Using UK Biobank data, the researchers tracked participants through age 65, drawing on hospital records, death registries and self-reported medical histories. Those born just after the cutoff, who were required to stay in school longer, were less likely to have a recorded diagnosis of Alzheimer’s disease or related dementias.
The authors also combined the reform comparison with genetic information. They reported that the lower incidence associated with the additional schooling was present among participants with high genetic susceptibility. The study does not show that education eliminates inherited risk, or that an individual’s outcome can be predicted from this finding. It reports an effect of the reform-induced schooling difference in the population studied.
Schooling and Inherited Dementia Risk
The study addresses a limitation of earlier research: although people with more education have often been found to have lower dementia rates, that association alone cannot establish that schooling caused the difference. Family resources, childhood health and other circumstances may influence both educational attainment and health later in life. By using a policy cutoff to compare people with similar birth dates, the researchers sought to estimate the effect of additional schooling more directly.
The results raise the possibility that education earlier in life may be associated with health outcomes many decades later, if the relationship persists as participants age. The genetic finding indicates that the reported association was also present among participants with higher inherited susceptibility; it does not show that education removes or overrides genetic risk. The study does not establish a particular education policy as a dementia-prevention measure. It adds evidence about possible relationships between social conditions, education and dementia risk.
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The 1972 Schooling Cutoff
Before this study, researchers had observed that people with more schooling were less likely to develop dementia, but those comparisons could not readily separate education from other differences between people. The British reform created a specific change in the minimum time many teenagers spent in school, allowing researchers to examine outcomes among people on either side of a defined birth-date threshold.
The authors describe their design as evidence that the additional education induced by the reform reduced dementia incidence, rather than simply showing that education and dementia diagnoses occur together. The study also found that the extra schooling increased household income and was associated with lower incidence of stroke and heart attack. Those outcomes may help frame possible pathways, but the researchers could not determine which, if any, explains the dementia result.
“Our findings provide evidence that education itself can reduce dementia risk decades later.”
— Silvia Barcellos, lead author and health economist affiliated with USC’s Schaeffer Institute and the University of Wisconsin–Madison
Effect Size and Long-Term Follow-Up
The researchers cautioned that the study cannot yet pin down how much the extra schooling reduced dementia risk. Dementia was uncommon in this comparatively young group, so the estimates are imprecise. Participants were followed through age 65, and the findings may change as more people reach ages when dementia becomes more common.
The study also does not identify the mechanism behind the association. More education could affect later health through employment, income, cognitively stimulating work or changes in social and health circumstances, but the analysis did not establish which pathway accounts for the result. The report describes a reduction in diagnoses; it does not demonstrate that schooling prevents every form of dementia or that the same effect applies equally in other countries or generations.
Following Participants as They Age
The researchers say continued follow-up will help determine whether the lower dementia incidence persists as participants grow older and diagnoses become more common. Longer observation could also improve estimates of the size of the effect. Further research will be needed to test the possible pathways connecting schooling with later-life brain health and to assess whether the findings apply beyond people affected by this particular reform.
Key Questions
What did the 1972 reform change?
It raised the minimum school-leaving age from 15 to 16 in England, Scotland and Wales. Students born on or after September 1, 1957, had to stay in school longer than those born just before the cutoff.
What did the researchers find about dementia?
People required by the reform to spend an additional year in school were less likely to receive a dementia diagnosis by age 65 than those born just before the cutoff, according to the study.
Did the reported association include people with high genetic risk?
Yes. The authors reported a reduction in dementia incidence among participants with high genetic susceptibility. The result does not mean that education removes inherited risk or guarantees a particular outcome.
How strong is the evidence?
The policy cutoff allowed researchers to compare people born close together who faced different schooling rules, helping address some limits of ordinary observational comparisons. However, dementia cases were uncommon in this relatively young group, making the estimates imprecise.
Why might more education affect dementia risk?
The researchers could not identify the mechanism. Possible pathways include changes in income, work and social or health circumstances; the study found some related outcomes but did not establish which pathway explains the dementia finding.
Source: rss
