Questionnaire data

Adding extra layers of detail

We regularly send web-based questionnaires to around 330,000 participants for whom we have an email address. These are also available to participants without an email address via the participant website. These questionnaires aim to collect new or more detailed data for which longitudinal repeats are important or information on health outcomes that is not easily available via linkage to electronic health records, for example on chronic pain and mental health. We plan to release web-based questionnaires approximately twice a year.