Surgery Today

, Volume 49, Issue 1, pp 65–71 | Cite as

Evaluating the quality of data from the Japanese National Clinical Database 2011 via a comparison with regional government report data and medical charts

  • Ai Tomotaki
  • Hiraku KumamaruEmail author
  • Hideki Hashimoto
  • Arata Takahashi
  • Minoru Ono
  • Tadashi Iwanaka
  • Hiroaki Miyata
Original Article



The aim of this study was to examine the quality of data from the National Clinical Database (NCD) via a comparison with regional government report data and medical charts.


A total of 1,165,790 surgical cases from 3007 hospitals were registered in the NCD in 2011. To evaluate the NCD’s data coverage, we retrieved regional government report data for specified lung and esophageal surgeries and compared the number with registered cases in the NCD for corresponding procedures. We also randomly selected 21 sites for on-site data verification of eight demographic and surgical data components to assess the accuracy of data entry.


The numbers of patients registered in the NCD and regional government report were 46,143 and 48,716, respectively, for lung surgeries and 7494 and 8399, respectively, for esophageal surgeries, leading to estimated coverages of 94.7% for lung surgeries and 89.2% for esophageal surgeries. According to on-site verification of 609 cases at 18 sites, the overall agreement between the NCD data components and medical charts was 97.8%.


Approximately, 90–95% of the specified lung surgeries and esophageal surgeries performed in Japan were registered in the NCD in 2011. The NCD data were accurate relative to medical charts.


Clinical registry Data quality National Clinical Database Quality improvement initiatives 



The authors thank all of the staff and academic societies involved in the National Clinical Database. AT, HK, and HM are affiliated with the Department of Healthcare Quality Assessment at the University of Tokyo, which is a social collaboration department supported by the National Clinical Database, Johnson & Johnson K.K., and Nipro corporation. The authors have no other conflicts of interest to declare. The data verification activities were supported by the National Clinical Database.

Supplementary material

595_2018_1700_MOESM1_ESM.docx (24 kb)
Supplementary material 1 (DOCX 23 KB)


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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Ai Tomotaki
    • 1
    • 2
  • Hiraku Kumamaru
    • 2
    Email author
  • Hideki Hashimoto
    • 3
  • Arata Takahashi
    • 2
    • 4
  • Minoru Ono
    • 5
  • Tadashi Iwanaka
    • 6
  • Hiroaki Miyata
    • 2
    • 4
  1. 1.InformaticsNational College of NursingKiyose-shiJapan
  2. 2.Department of Healthcare Quality Assessment, Graduate School of MedicineThe University of TokyoTokyoJapan
  3. 3.Department of Health and Social Behavior, School of Public HealthThe University of TokyoTokyoJapan
  4. 4.Department of Health Policy and Management, School of MedicineKeio UniversityTokyoJapan
  5. 5.Department of Cardiovascular Surgery, Graduate School of MedicineThe University of TokyoTokyoJapan
  6. 6.Bureau of Saitama Prefectural HospitalsSaitama-shiJapan

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