Evidence map›Paper›PMID 33977008›Full record

ArticleJournal of general and family medicine2021

Data resource profile: JMDC claims database sourced from health insurance societies.

Katsuhiko Nagai, Takashi Tanaka, Norihisa Kodaira, Shinya Kimura, Yoshimitsu Takahashi, Takeo Nakayama

Abstract read
In one paragraph

Article in Journal of general and family medicine, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 126 papers.

0numbers the graph read from it
0cells of the map it votes in
126citing papers in PubMed
–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

126 citing papers in PubMed.

  1. Article
  2. Cost-effectiveness analysis of early antihypertensive treatment for hypertension detected at health screening.Hypertension research : official journal of the Japanese Society of Hypertension · 2026
    Article
  3. Article
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  5. Article
  6. Article
  7. Comparison of oral third- versus first-/ second-generation cephalosporins for acute uncomplicated cystitis: a nationwide retrospective cohort study.European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology · 2026
    Article
  8. Medication use during pregnancy in Japan from 2005 to 2019: Trends and safety considerations.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2026
    Article
  9. Article
  10. Article
  11. Article
  12. Prescription trends for combined oral contraceptives and thromboembolism incidence in Japan before and after public awareness events in 2013-2015.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2026
    Article
  13. One-year body mass index change and subsequent risk of lumbar disc herniation: a population-based cohort study.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2026
    Article
  14. Article
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  19. Article
  20. Cardiac monitoring in adolescent and young adult cancer patients treated with anthracyclines: a longitudinal descriptive study.Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer · 2026
    Article

66 more citing papers are in PubMed but not listed here.

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

6 authors.

Katsuhiko NagaiJMDC Inc. Tokyo Japan.ORCID https://orcid.org/0000-0001-8900-6019
Takashi TanakaJMDC Inc. Tokyo Japan.
Norihisa KodairaJMDC Inc. Tokyo Japan.
Shinya KimuraJMDC Inc. Tokyo Japan.
Yoshimitsu TakahashiDepartment of Health Informatics Kyoto University School of Public Health Kyoto Japan.
Takeo NakayamaDepartment of Health Informatics Kyoto University School of Public Health Kyoto Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

JMDC, Inc. (JMDC) has created a database, using data collected from health insurance societies in Japan, consisting of ledgers of insureds, claims (for hospitalization, outpatient treatment, drug preparation, and dental treatment), and health checkup results. The earliest data are from the claims in January 2005, except dental claims from December 2009 and health checkup results from April 2008. Currently (the end of June 2020), the number of insureds included is approximately 9.8 million. This database is unique for Japan and has the following characteristics: (a) the basic population can be ascertained; (b) standardization is carried out using a dictionary; and (c) anonymized individual IDs can be followed on the basis of a time-series over various periods, with the earliest starting date being January 2005. However, it has certain limitations, in that the disease status and test results cannot be ascertained, and there is insufficient access to data for elderly people.

Indexed as

databasehealth insurancehealth insurance societiesJapan

Identifiers

PMID33977008
PMCPMC8090843

What OpenQuestion holds

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Registered trials

None linked

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.