Individual Study / IPHS

Ibaraki Prefectural Health Study

Ibaraki Prefectural Health Study

Initiatives -
Validity of a Risk Prediction Equation for Chronic kidney disease (CKD) is an important health problem for which risk equations have been developed for Western populations. This study aimed to develop and validate a risk prediction equation for CKD in a Japanese population. *Note: All published information has been collected from the article referenced in the Marker Paper box below. Therefore, there may be variations with more advanced versions of the study. *
Start Year
End Year


Investigators Contacts
  • Dr. Mitsumassa Umesawa
    Dokkyo Medical University


Study design
Population cohort
Follow Up
Follow-up information was available from health checkups 20 years after the initial evaluation. To ascertain deaths in the cohort, investigators conducted a systematic review of death certificates. Data from health check-ups and dates of death or moving were obtained from local governments.

Marker Paper

Umesawa M, Sairenchi T, Haruyama Y, Nagao M, Yamagishi K, Irie F, Watanabe H, Kobashi G, Iso H, Ota H. Validity of a Risk Prediction Equation for CKD After 10 Years of Follow-up in a Japanese Population: The Ibaraki Prefectural Health Study. Am J Kidney Dis. 2018 Jun;71(6):842-850. doi: 10.1053/j.ajkd.2017.09.013. Epub 2017 Dec 1. PMID: 29198643.

PUBMED 29198643


Sources of Recruitment
  • Individuals

Number of participants

Number of participants
Number of participants with biosamples
Supplementary Information
Participants who completed an annual health checkup in 1993 to 1996 in the Ibaraki Prefecture in Japan. Participants were initially free of CKD (defined as stage 3, 4, or 5 CKD or proteinuria [2+ or 3+] by dipstick).


Availability of data and biosamples