The study used Korea's national health screening database to classify 741,655 adults aged 66 by cognitive screening score and Timed Up and Go time, then followed them for a mean of 10.9 years, over which 11.4% of the whole cohort developed dementia. Those with both impairments had an adjusted subdistribution hazard ratio for dementia of 1.74 (95% CI 1.67-1.81). Death, disability and long-term care use were also higher, by 34%, 42% and 44% respectively.
Why it is interesting: A two-minute walking test and a brief questionnaire, both recorded routinely at one age, separate groups with markedly different ten-year dementia and care trajectories.