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Functional Status

Public Health and Nutrition · NLM MeSH · updated 2026-11-04 · version 1

Citations verified against PubMedNot yet clinician-reviewed10 referencesApproximately 7 min read

Ability regarding basic physical and cognitive activities such as walking or reaching, focusing attention, and communicating, as well as the routine activities of daily living, including eating, bathing, dressing, transferring, an

Table of Contents

1. Definition2. Research landscape3. Reading the evidence4. Open-access studies5. Key reviews6. References7. About this article

Definition and research guide

This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.

Content available: 4 complete abstracts (1,271 words), 10 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.

Definition

Ability regarding basic physical and cognitive activities such as walking or reaching, focusing attention, and communicating, as well as the routine activities of daily living, including eating, bathing, dressing, transferring, and toileting; and life situations such as school or play for children and, for adults, work outside the home or maintaining a household. (from https://www.ncvhs.hhs.gov/wp-content/uploads/2017/08/010617rp.pdf)

Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.

Also known as: Status, Functional; Functional Dependence; Functional Independence; Independence, Functional.

Where it fits in the MeSH classification

Broader topics
Activities of Daily Living; Health Status

Research landscape

PubMed indexes 2,395 records tagged with the MeSH heading “Functional Status” (counts retrieved 2026-10-31). 2,374 of them (99.1%) were published from 2020 onward, and the busiest period so far is 2020 onward with 2,374 records.

Reviews account for 227 records (9.5%) and meta-analyses for 101. Randomized controlled trials number 193 (8.1%) as a share of all records on the topic. Randomized trials make up a comparatively large share of this literature, which means many treatment questions have been tested directly.

PubMed records by publication periodthrough 1999: 0 records; 2000-2009: 0 records; 2010-2019: 115 records; 2020 onward: 2,374 records0through 199902000-20091152010-20192,3742020 onward
Records in PubMed indexed with this heading, by publication period. Real counts from NCBI E-utilities; the final period covers only part of the current year. Volume reflects how much has been published, not how strong the evidence is.
Show the data
PeriodRecords
through 19990
2000-20090
2010-2019115
2020 onward2,374
Share of records by publication typeReviews: 9.5 percent; Meta-analyses: 4.2 percent; Randomized controlled trials: 8.1 percentReviews9.5% (227)Meta-analyses4.2% (101)Randomized controlled trials8.1% (193)
Share of all PubMed records on this heading that carry each publication type. Types overlap with other records, so the shares do not sum to 100%.
Publication-type chart data
Publication types among 2,395 PubMed records
TypeRecordsShare
Reviews2279.5%
Meta-analyses1014.2%
Randomized controlled trials1938.1%

Method: PubMed query "Functional Status"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-31.

Reading the evidence in public health and nutrition

Population and nutrition studies mostly observe what people eat, breathe or are exposed to and then look for links with health, which shows association and not proof of cause. Self-reported diet is imprecise, people who eat or live differently also differ in other ways, and effects measured across a population may not apply to one person. Check the study design, how exposure was measured, what else was accounted for and the size of the effect, not only whether it was statistically significant.

Evidence from open-access studies

These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.

Study comparison — selected abstracts, not a systematic review
Study / authorsYearSource label / designEurope PMC citationsLicence / source
Construct validity of the Post-COVID-19 Functional Status Scale in adult subjects with COVID-19
Machado FVC, Meys R, Delbressine JM, Vaes AW, Goërtz YMJ, van Herck M, et al.
2021Research article
Design not recorded in structured metadata
109cc by
PMID 33536042 · DOI · PMC7856622
Physical functional performance and prognosis in patients with heart failure: a systematic review and meta-analysis
Fuentes-Abolafio IJ, Stubbs B, Pérez-Belmonte LM, Bernal-López MR, Gómez-Huelgas R, Cuesta-Vargas AI
2020Meta-analysis
Design not recorded in structured metadata
103cc by
PMID 33297975 · DOI · PMC7724724
Socioeconomic Disparities in Functional Status in a National Sample of Patients With Rheumatoid Arthritis
Izadi Z, Li J, Evans M, Hammam N, Katz P, Ogdie A, et al.
2021Research article
Design not recorded in structured metadata
60cc by
PMID 34347058 · DOI · PMC8339935
Association between fatigue and functional status among patients with multiple sclerosis
Abo Zaid EEM, Elshamaa ETM, Khalifa AM
2026Research article
Design not recorded in structured metadata
0cc by
PMID 42621477 · DOI · PMC13488550

Construct validity of the Post-COVID-19 Functional Status Scale in adult subjects with COVID-19 [1]

Research article Machado FVC, Meys R, Delbressine JM, Vaes AW, Goërtz YMJ, van Herck M, et al. · · 2021 · cited 109 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
BackgroundAn increasing number of subjects are recovering from COVID-19, raising the need for tools to adequately assess the course of the disease and its impact on functional status.
Closing excerpt
ConclusionWe demonstrated the construct validity of the PCFS Scale in highly-symptomatic adult subjects with confirmed and presumed COVID-19, 3 months after the onset of symptoms.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (261 words)

BackgroundAn increasing number of subjects are recovering from COVID-19, raising the need for tools to adequately assess the course of the disease and its impact on functional status. We aimed to assess the construct validity of the Post-COVID-19 Functional Status (PCFS) Scale among adult subjects with confirmed and presumed COVID-19.MethodsAdult subjects with confirmed and presumed COVID-19, who were members of an online panel and two Facebook groups for subjects with COVID-19 with persistent symptoms, completed an online survey after the onset of infection-related symptoms. The number and intensity of symptoms were evaluated with the Utrecht Symptom Diary, health-related quality of life (HrQoL) with the 5-level EQ-5D questionnaire, impairment in work and activities with the Work Productivity and Activity Impairment questionnaire and functional status with the PCFS Scale.Results1939 subjects were included in the analyses (85% women, 95% non-hospitalized during infection) about 3 months after the onset of infection-related symptoms. Subjects classified as experiencing 'slight', 'moderate' and 'severe' functional limitations presented a gradual increase in the number/intensity of symptoms, reduction of HrQoL and impairment in work and usual activities. No differences were found regarding the number and intensity of symptoms, HrQoL and impairment in work and usual activities between subjects classified as experiencing 'negligible' and 'no' functional limitations. We found weak-to-strong statistical associations between functional status and all domains of HrQoL (r: 0.233-0.661). Notably, the strongest association found was with the 'usual activities' domain of the 5-level EQ-5D questionnaire.ConclusionWe demonstrated the construct validity of the PCFS Scale in highly-symptomatic adult subjects with confirmed and presumed COVID-19, 3 months after the onset of symptoms.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 33536042 · DOI · PMC7856622

Physical functional performance and prognosis in patients with heart failure: a systematic review and meta-analysis [2]

Meta-analysis Fuentes-Abolafio IJ, Stubbs B, Pérez-Belmonte LM, Bernal-López MR, Gómez-Huelgas R, Cuesta-Vargas AI · · 2020 · cited 103 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
BackgroundPatients with Heart Failure (HF) show impaired functional capacities which have been related to their prognosis.
Closing excerpt
Most of the included studies reported a low risk of bias, and GRADE criteria showed a low and a moderate level of evidence per outcome.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (310 words)

BackgroundPatients with Heart Failure (HF) show impaired functional capacities which have been related to their prognosis. Moreover, physical functional performance in functional tests has also been related to the prognosis in patients with HF. Thus, it would be useful to investigate how physical functional performance in functional tests could determine the prognosis in patients with HF, because HF is the leading cause of hospital admissions for people older than 65 years old. This systematic review and meta-analysis aims to summarise and synthesise the evidence published about the relationship between physical functional performance and prognosis in patients with HF, as well as assess the risk of bias of included studies and the level of evidence per outcome.MethodsMajor electronic databases, such as PubMed, AMED, CINAHL, EMBASE, PEDro, Web of Science, were searched from inception to March 2020 for observational longitudinal cohort studies (prospective or retrospective) examining the relationship between physical functional performance and prognosis in patients with HF.Results44 observational longitudinal cohort studies with a total of 22,598 patients with HF were included. 26 included studies reported a low risk of bias, and 17 included studies showed a moderate risk of bias. Patients with poor physical functional performance in the Six Minute Walking Test (6MWT), in the Short Physical Performance Battery (SPPB) and in the Gait Speed Test showed worse prognosis in terms of larger risk of hospitalisation or mortality than patients with good physical functional performance. However, there was a lack of homogeneity regarding which cut-off points should be used to stratify patients with poor physical functional performance from patients with good physical functional performance.ConclusionThe review includes a large number of studies which show a strong relationship between physical functional performance and prognosis in patients with HF. Most of the included studies reported a low risk of bias, and GRADE criteria showed a low and a moderate level of evidence per outcome.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 33297975 · DOI · PMC7724724

Socioeconomic Disparities in Functional Status in a National Sample of Patients With Rheumatoid Arthritis [3]

Research article Izadi Z, Li J, Evans M, Hammam N, Katz P, Ogdie A, et al. · · 2021 · cited 60 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
ImportanceLittle is known about the association of poverty with functional status (FS) in patients with rheumatoid arthritis (RA) who use rheumatology care.
Closing excerpt
These findings provide a framework for monitoring disparities in RA and for generating evidence to spur action toward achieving health equity.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (388 words)

ImportanceLittle is known about the association of poverty with functional status (FS) in patients with rheumatoid arthritis (RA) who use rheumatology care.ObjectivesTo examine the association between socioeconomic status (SES) and FS among patients with RA and to evaluate the association between SES and functional declines over time in patients who received at least some rheumatology care.Design, setting, and participantsThis cohort study used data from the American College of Rheumatology's Rheumatology Informatics System for Effectiveness (RISE) registry between January 1, 2016, and December 31, 2018. Analyses included all adult patients with a confirmed RA diagnosis (ie, had ≥2 encounters associated with RA International Classification of Diseases codes ≥30 days apart) and at least 1 FS score documented between 2016 and 2018 seen at participating rheumatology practices. Data analysis was conducted from April to December 2020.ExposuresThe Area Deprivation Index (ADI), a zip code-based indicator of neighborhood poverty, was used as a proxy for SES. ADI scores were categorized into quintiles.Main outcomes and measuresFS measures included Multidimensional Health Assessment Questionnaire (MDHAQ), Health Assessment Questionnaire Disability index, and Health Assessment Questionnaire-II. Cross-sectionally, mean FS scores were compared across ADI quintiles. Longitudinally, among patients with at least 2 FS scores, multilevel multivariate regression computed the probability of functional decline, defined as a change greater than the minimum clinically important difference, across ADI quintiles. In a subgroup analysis, whether disease activity mediated the association between SES and functional decline was examined.ResultsOf the 83 965 patients included in the study, 66 649 (77%) were women, and 60 037 (72%) were non-Hispanic White. Mean (SD) age was 63.4 (13.7) years. MDHAQ was the most reported FS measure (56 928 patients [67.8%]). For all measures, mean (SD) FS score was worse at lower SES levels (eg, for MDHAQ quintile 1: 1.79 [1.87]; quintile 5: 2.43 [2.17]). In longitudinal analyses, the probability of functional decline was 14.1% (95% CI, 12.5%-15.7%) in the highest SES quintile and 18.9% (95% CI, 17.1%-20.7%) in the lowest SES quintile. The association between SES and functional decline was partially mediated (7%; 95% CI, 4%-22%) by disease activity.Conclusions and relevanceIn this cohort study of patients with RA, worse FS and faster declines in functioning over time were observed in patients with lower SES. These findings provide a framework for monitoring disparities in RA and for generating evidence to spur action toward achieving health equity.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 34347058 · DOI · PMC8339935

Association between fatigue and functional status among patients with multiple sclerosis [4]

Research article Abo Zaid EEM, Elshamaa ETM, Khalifa AM · · 2026

Abstract reading summary — source excerpts
Opening excerpt
BackgroundFatigue is one of the most common and disabling symptoms experienced by patients with multiple sclerosis (MS).
Closing excerpt
Routine assessment of fatigue and the development of comprehensive fatigue-management strategies may help identify patients at risk of functional limitations and support the delivery of individualized care aimed at maintaining independence, mobility, and quality of life among individuals with MS.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (312 words)

BackgroundFatigue is one of the most common and disabling symptoms experienced by patients with multiple sclerosis (MS). This study aimed to assess the association between fatigue and functional status among patients with multiple sclerosis.MethodsA descriptive correlational cross-sectional study was conducted in September 2025 to January 2026, on 78 patients diagnosed with MS using a purposive sampling method, at Nasser Institute Hospital, Egypt. Data were collected using a structured interview questionnaire, the Fatigue Severity Scale, Lawton and Brody's Instrumental Activities of Daily Living Scale (IADL), the MS Walking Scale, and the Social Functioning Questionnaire. Data were analyzed using SPSS version 25. Statistical significance was considered at p ResultsAfter assessment using the Fatigue Severity Scale, 46.1% of participants were classified as having severe fatigue, 52.6% had moderate fatigue, and 1.3% had mild fatigue. Female participants reported higher fatigue scores than males. More than half of the participants demonstrated impaired social functioning, and a considerable proportion exhibited dependence in instrumental activities of daily living and moderate-to-severe walking impairment. Significant positive correlations were observed between fatigue severity and dependence in instrumental activities of daily living, walking impairment, and social dysfunction (all p R 2 = 0.545, adjusted R 2 = 0.500, F = 11.984, p β = 0.371, p = 0.010) and poorer instrumental activities of daily living (IADL; β = 0.311, p = 0.033) remained independently associated with higher fatigue severity, whereas social functioning was not independently associated with fatigue severity after adjustment (β = 0.200, p = 0.095).ConclusionFatigue is highly prevalent among patients with MS and is significantly associated with poorer functional status, particularly reduced instrumental activities of daily living and greater walking impairment. Routine assessment of fatigue and the development of comprehensive fatigue-management strategies may help identify patients at risk of functional limitations and support the delivery of individualized care aimed at maintaining independence, mobility, and quality of life among individuals with MS.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 42621477 · DOI · PMC13488550

Key reviews and meta-analyses

The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.

  • Research article Decline in biological resilience as key manifestation of aging: Potential mechanisms and role in health and longevity [5]
    Ukraintseva S, Arbeev K, Duan M, Akushevich I, Kulminski A, Stallard E, et al. · Mech Ageing Dev · 2021 · cited 71 times (Europe PMC)
  • Research article Risk factors for mortality in elderly haemodialysis patients: a systematic review and meta-analysis [6]
    Song YH, Cai GY, Xiao YF, Chen XM · BMC Nephrol · 2020 · cited 51 times (Europe PMC)
  • Research article II. Indices of Pain Intensity Derived From Ecological Momentary Assessments and Their Relationships With Patient Functioning: An Individual Patient Data Meta-analysis [7]
    Schneider S, Junghaenel DU, Broderick JE, Ono M, May M, Stone AA · J Pain · 2021 · cited 38 times (Europe PMC)
  • Research article The benefits of early palliative care on psychological well-being, functional status, and health-related quality of life among cancer patients and their caregivers: a systematic review and meta-analysis [8]
    Haroen H, Maulana S, Harun H, Mirwanti R, Sari CWM, Platini H, et al. · BMC Palliat Care · 2025 · cited 37 times (Europe PMC)
  • Research article Functional Impairments and Theory of Mind Deficits in Schizophrenia: A Meta-analysis of the Associations [9]
    Thibaudeau É, Cellard C, Turcotte M, Achim AM · Schizophr Bull · 2021 · cited 32 times (Europe PMC)
  • Research article International depiction of the cost of functional independence limitations among older adults living in the community: a systematic review and cost-of-impairment study [10]
    Falck RS, Percival AG, Tai D, Davis JC · BMC Geriatr · 2022 · cited 28 times (Europe PMC)

References

  1. Machado FVC, Meys R, Delbressine JM, Vaes AW, Goërtz YMJ, van Herck M, et al.. Construct validity of the Post-COVID-19 Functional Status Scale in adult subjects with COVID-19. . 2021. PMID 33536042 · DOI · PMC7856622
  2. Fuentes-Abolafio IJ, Stubbs B, Pérez-Belmonte LM, Bernal-López MR, Gómez-Huelgas R, Cuesta-Vargas AI. Physical functional performance and prognosis in patients with heart failure: a systematic review and meta-analysis. . 2020. PMID 33297975 · DOI · PMC7724724
  3. Izadi Z, Li J, Evans M, Hammam N, Katz P, Ogdie A, et al.. Socioeconomic Disparities in Functional Status in a National Sample of Patients With Rheumatoid Arthritis. . 2021. PMID 34347058 · DOI · PMC8339935
  4. Abo Zaid EEM, Elshamaa ETM, Khalifa AM. Association between fatigue and functional status among patients with multiple sclerosis. . 2026. PMID 42621477 · DOI · PMC13488550
  5. Ukraintseva S, Arbeev K, Duan M, Akushevich I, Kulminski A, Stallard E, et al.. Decline in biological resilience as key manifestation of aging: Potential mechanisms and role in health and longevity. Mech Ageing Dev. 2021. PMID 33340523 · DOI · PMC7882032
  6. Song YH, Cai GY, Xiao YF, Chen XM. Risk factors for mortality in elderly haemodialysis patients: a systematic review and meta-analysis. BMC Nephrol. 2020. PMID 32867718 · DOI · PMC7457491
  7. Schneider S, Junghaenel DU, Broderick JE, Ono M, May M, Stone AA. II. Indices of Pain Intensity Derived From Ecological Momentary Assessments and Their Relationships With Patient Functioning: An Individual Patient Data Meta-analysis. J Pain. 2021. PMID 33203516 · DOI · PMC8043976
  8. Haroen H, Maulana S, Harun H, Mirwanti R, Sari CWM, Platini H, et al.. The benefits of early palliative care on psychological well-being, functional status, and health-related quality of life among cancer patients and their caregivers: a systematic review and meta-analysis. BMC Palliat Care. 2025. PMID 40296046 · DOI · PMC12036283
  9. Thibaudeau É, Cellard C, Turcotte M, Achim AM. Functional Impairments and Theory of Mind Deficits in Schizophrenia: A Meta-analysis of the Associations. Schizophr Bull. 2021. PMID 33433606 · DOI · PMC8084438
  10. Falck RS, Percival AG, Tai D, Davis JC. International depiction of the cost of functional independence limitations among older adults living in the community: a systematic review and cost-of-impairment study. BMC Geriatr. 2022. PMID 36273139 · DOI · PMC9587635

About this article

Sources
NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
Verification
Every reference was resolved against PubMed on 2026-11-04; title, year and DOI matched.
Review state
automated source verified; no human expert review has been recorded yet.
Version
1, last updated 2026-11-04.

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At a glance

2,395
PubMed records on this heading
99%
published since 2020
227
review articles
193
randomized trials
10
verified references below

Counts come from PubMed on 2026-10-31; they show how much has been written, not how strong the evidence is.

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