Abstract: Objective · To introduce how to build a data platform of data collection and data management for multi-center birth cohort study by using REDCap. Methods · After the REDCap electronic data capture system was installed and set up, the electronic case report forms (eCRFs) were programmed to collect data in multi-centers. The rules of data quality control were programmed, and different levels of user right for access to data platform were assigned to the data managers and data clerks based on their role in research project. Results · With REDCap system being installed, the example project was created, and a series of eCRFs were established for each stage of preconception, pregnancy and childhood through follow-up. After intensive testing to improve and achieve a stable data platform, standardized trainings were provided to data-related team. The REDCap eCRFs were then put in use online. By assigning different user right of access to data platform, data entry can be from multi- research centers and survey sites. This REDCap data platform supported the cohort project on data collection and data management. Conclusion · The data platform established by using REDCap provides strong support to birth cohorts on data collection and data management. This example project of data platform can be applied to other epidemiological studies.

Key words: REDCap, electronic data capture, data management, birth cohort