The National Health and Aging Trends Study (NHATS) tracks disability and dementia in U.S. Medicare beneficiaries over age 65.
Its companion, the National Study of Caregiving (NSOC), tracks caregivers, while memory-concern cases stay uncertain because self-reports often miss diagnosed dementia and strain varies. NHATS follows the same people each year and NSOC follows the people who help them. Together they show who needs help, who gives it, and where survey answers fall short for families facing memory changes.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What do NHATS and NSOC each track?
- How do the surveys define dementia?
- What does caregiving strain look like?
- Why should families act when surveys miss dementia?
What do NHATS and NSOC each track?
NHATS is an ongoing panel of Medicare beneficiaries over age 65, surveyed each year since 2011 by in-home interview, as described in the JAMA methods summary. It oversamples people age 90 and older and Black older adults to keep those groups visible.
NSOC interviews up to five helpers for each NHATS participant who receives help. The NIA continuation notice says NSOC collected caregiver interviews in 2011, 2015 and 2017 and added a time diary of activities, duration, company and feelings. That pairing lets readers see care from both sides.
How do the surveys define dementia?
NHATS groups people as probable dementia, possible dementia, or no dementia with a tested algorithm, also detailed in the JAMA methods summary. The algorithm uses reported diagnosis, proxy reports, an informant score of 2 or more on the AD8, and low scores on memory, orientation and executive-function tests.
Probable means several signals point the same way. Possible means fewer or weaker signals are present. The label is a survey category, not a clinic diagnosis.
What does caregiving strain look like?
Caregivers of older adults with possible and probable dementia report more physical, emotional and financial strain than other caregivers. The pattern is graded by dementia status in 2,652 linked NHATS-NSOC pairs, according to the 2026 Frontiers in Psychology editorial.
NSOC III added care-medical involvement modules and two prior-day diaries. The Johns Hopkins project summary says those tools allow direct contrasts of dementia and non-dementia caregivers from both recipient and caregiver views.
Why should families act when surveys miss dementia?
About 67% of self-responding older adults with a Medicare-claims dementia diagnosis said no doctor ever told them they had dementia, compared with 23% for hypertension and 17% for arthritis, reported by Yale in the Futurity summary. Self-reported memory-concern data therefore understates diagnosed disease.
NIA directs NHATS and NSOC to keep core disability and dementia content while adding stronger cognitive, sensory, dementia-care, life-course, residential-care and activity measures. Use that gap as a prompt to check care now:.
- Ask the doctor directly whether memory tests point to dementia or another cause.
- List who helps with meals, bathing, rides, bills and medical visits.
- Note hours, sleep loss, mood change and money strain for helpers.
- Bring a family member or helper to the next visit when memory slips affect answers.
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