Data Overview

Details of the data collected by the CKB are provided on the Study Resources section of the website. Data made available to external researchers through the CKB Data Access System will have undergone all necessary quality control including standardization, validation, and adjudication where appropriate. The schedule below includes an anticipated period of exclusive use for the CKB collaborative team in China and the UK following the completion of data collection and processing. During this period the CKB team will actively seek to engage with external collaborators on topics of particular interest. 

Available data

The initial data release comprised of approved data collected from 512,000 individuals at the baseline survey, including demographics, socio-economic status, lifestyle behaviours, medical history and physical measurements.

The International Journal of Epidemiology paper China Kadoorie Biobank of 0.5 million people: Survey methods baseline characteristics and long-term follow up provides a comprehensive summary of the data collected. The Baseline Questionnaire and 1st Resurvey Questionaire provide further details on individual data fields and their storage. A Microsoft Word version of the Data Request Form provides details of the questionaire categories and cause specific mortality endpoints that are available.  


Data Release Schedule (Censor Date 1/1/2015)

Data Description

China release:

Rest of World release:

Baseline (Cross-sectional)

Baseline survey data



Resurvey Data (Cross-sectional)

1st Resurvey Data (c.20,000)


1 September 2018

Follow-up / prospective data (ICD-10 coded)

Cause-Specific Mortality 


1 September 2018