Evidence map›Paper›PMID 34753531›Full record

ArticlePrimary health care research & development2021

Revisiting the four core functions (4Cs) of primary care: operational definitions and complexities.

Geronimo Jimenez, David Matchar, Gerald Choon Huat Koh, Shilpa Tyagi, Rianne M J J van der Kleij, Niels H Chavannes, Josip Car

Abstract read
In one paragraph

Article in Primary health care research & development, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 45 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
45citing papers in PubMed, 3 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

45 citing papers in PubMed, 3 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. The impact of remote care approaches on continuity in primary care: a mixed-studies systematic review.The British journal of general practice : the journal of the Royal College of General Practitioners · 2023
    Pooled it
  4. Trial
  5. Review
  6. Review
  7. Improving Primary Healthcare: Applying Grapevine (Healthcare (Basel, Switzerland) · 2026
    Article
  8. Article
  9. Review
  10. System changes to empower primary care in Alzheimer's disease detection and care.Alzheimer's & dementia : the journal of the Alzheimer's Association · 2026
    Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Identifying social prescribing core outcomes using a Delphi approach: findings and future directions.Health promotion and chronic disease prevention in Canada : research, policy and practice · 2026
    Article
  17. Article
  18. Article
  19. Article
  20. Implementation of the Person-Centered Primary Care Measure.Journal of the American Board of Family Medicine : JABFM · 2025
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Geronimo JimenezCentre for Population Health Sciences (CePHaS), Lee Kong, Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.ORCID 0000-0002-1304-426X
David MatcharHealth Services and Systems Research (HSSR), Duke-NUS Medical School, Singapore, Singapore.
Gerald Choon Huat KohSaw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore.
Shilpa TyagiSaw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore.
Rianne M J J van der KleijDepartment of Public Health and Primary Care, Leiden University Medical Center, Leiden, The Netherlands.
Niels H ChavannesDepartment of Public Health and Primary Care, Leiden University Medical Center, Leiden, The Netherlands.
Josip CarCentre for Population Health Sciences (CePHaS), Lee Kong, Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe four primary care (PC) core functions (the '4Cs', ie, first contact, comprehensiveness, coordination and continuity) are essential for good quality primary healthcare and their achievement leads to lower costs, less inequality and better population health. However, their broad definitions have led to variations in their assessment, in the innovations implemented to improve these functions and ultimately in their performance.

objectivesTo update and operationalise the 4Cs' definitions by using a literature review and analysis of enhancement strategies, and to identify innovations that may lead to their enhancement.

methodsNarrative, descriptive analysis of the 4Cs definitions, coming from PC international reports and organisations, to identify measurable features for each of these functions. Additionally, we performed an electronic search and analysis of enhancement strategies to improve these four Cs, to explore how the 4Cs inter-relate.

resultsSpecific operational elements for first contact include modality of contact, and conditions for which PC should be approached; for comprehensiveness, scope of services and spectrum of population needs; for coordination, links between PC and higher levels of care and social/community-based services, and workforce managing transitions and for continuity, type, level and context of continuity. Several innovations like enrolment, digital health technologies and new or enhanced PC provider's roles, simultaneously influenced two or more of the 4Cs.

conclusionProviding clear, well-defined operational elements for these 4Cs to measure their achievement and improve the way they function, and identifying the complex network of interactions among them, should contribute to the field in a way that supports efforts at practice innovation to optimise the processes and outcomes in PC.

Indexed as

Primary Health CareQuality of Health CareHumansResearch DesignSystematic Reviews as TopicWorkforcebasic concepts and modelscontinuitycoordinationcore functionshealth care organisation and managementprimary care

Identifiers

PMID34753531
PMCPMC8581591

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.