Data management

Data were stored in an internet-accessible database especially developed for this study. Selected parts of the database were accessible by research nurses, research staff, logistics companies, and participants. Data were entered into the database under direct supervision of the research team.

We have 100 meters of archive where we store over 33,800 questionnaires. More than 100,000 blood and DNA samples are stored in -80˚C freezers.

Randomisation tables were stored in a safe under supervision of a third person at Wageningen University who was otherwise not involved in the trial. Treatment codes remained sealed for research staff and committee members of the Alpha Omega Trial during the course of the trial.


Overview of measurements

General information
Lifestyle and Health
Mental health
Clinical events