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Activity limitations, use of assistive devices, and mortality and clinical events in 25 high-income, middle-income, and low-income countries: an analysis of the PURE study
- et al.
Published:July 25, 2024DOI:https://doi.org/10.1016/S0140-6736(24)01050-X
Summary
Background
The focus of most epidemiological studies has been mortality or clinical events, with
less information on activity limitations related to basic daily functions and their
consequences. Standardised data from multiple countries at different economic levels
in different regions of the world on activity limitations and their associations with
clinical outcomes are sparse. We aimed to quantify the prevalence of activity limitations
and use of assistive devices and the association of limitations with adverse outcomes
in 25 countries grouped by different economic levels.
Methods
In this analysis, we obtained data from individuals in 25 high-income, middle-income,
and low-income countries from the Prospective Urban Rural Epidemiological (PURE) study
(175 660 participants). In the PURE study, individuals aged 35–70 years who intended
to continue living in their current home for a further 4 years were invited to complete
a questionnaire on activity limitations. Participant follow-up was planned once every
3 years either by telephone or in person. The activity limitation screen consisted
of questions on self-reported difficulty with walking, grasping, bending, seeing close,
seeing far, speaking, hearing, and use of assistive devices (gait, vision, and hearing
aids). We estimated crude prevalence of self-reported activity limitations and use
of assistive devices, and prevalence standardised by age and sex. We used logistic
regression to additionally adjust prevalence for education and socioeconomic factors
and to estimate the probability of activity limitations and assistive devices by age,
sex, and country income. We used Cox frailty models to evaluate the association between
each activity limitation with mortality and clinical events (cardiovascular disease,
heart failure, pneumonia, falls, and cancer). The PURE study is registered with ClinicalTrials.gov, NCT03225586.
Findings
Between Jan 12, 2001, and May 6, 2019, 175 584 individuals completed at least one
question on the activity limitation questionnaire (mean age 50·6 years [SD 9·8]; 103 625
[59%] women). Of the individuals who completed all questions, mean follow-up was 10·7
years (SD 4·4). The most common self-reported activity limitations were difficulty
with bending (23 921 [13·6%] of 175 515 participants), seeing close (22 532 [13·4%]
of 167 801 participants), and walking (22 805 [13·0%] of 175 554 participants); prevalence
of limitations was higher with older age and among women. The prevalence of all limitations
standardised by age and sex, with the exception of hearing, was highest in low-income
countries and middle-income countries, and this remained consistent after adjustment
for socioeconomic factors. The use of gait, visual, and hearing aids was lowest in
low-income countries and middle-income countries, particularly among women. The prevalence
of seeing close limitation was four times higher (6257 [16·5%] of 37 926 participants
vs 717 [4·0%] of 18 039 participants) and the prevalence of seeing far limitation was
five times higher (4003 [10·6%] of 37 923 participants vs 391 [2·2%] of 18 038 participants) in low-income countries than in high-income countries,
but the prevalence of glasses use in low-income countries was half that in high-income
countries. Walking limitation was most strongly associated with mortality (adjusted
hazard ratio 1·32 [95% CI 1·25–1·39]) and most consistently associated with other
clinical events, with other notable associations observed between seeing far limitation
and mortality, grasping limitation and cardiovascular disease, bending limitation
and falls, and between speaking limitation and stroke.
Interpretation
The global prevalence of activity limitations is substantially higher in women than
men and in low-income countries and middle-income countries compared with high-income
countries, coupled with a much lower use of gait, visual, and hearing aids. Strategies
are needed to prevent and mitigate activity limitations globally, with particular
emphasis on low-income countries and women.
Funding
Funding sources are listed at the end of the Article.
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