There are three components of participant involvement in the TILDA study: a personal interview, a self-completion questionnaire and in every second Wave of the study, a detailed health assessment. Participants of the first wave of the TILDA study will have a follow-up interview every two years and a health assessment every three to four years.
Computer-Assisted Personal Interview (CAPI)
In each Wave of the TILDA study, participants first complete a face-to-face personal interview in their own homes. The interview is arranged for a time that suits the participant, and is carried out with the aid of a laptop computer by a trained, experienced interviewer from Behaviours & Attitudes (B&A), who carries photo ID. The local Gardaí will also know that the study is ongoing in their area.
Self-Completion Questionnaire (SCQ)
In each Wave of the study, once the participants have finished the face-to-face interview, the interviewer leaves the participant a short questionnaire, which should take about 15 minutes to complete. Participants can fill out the questionnaire in their own time and have the interviewer come back and collect it, or it can be posted back to us in the stamped addressed envelope it comes with.
In Wave 1, after carrying out the face-to-face interview and the self-completion questionnaire, participants were invited to attend our health centre in Trinity College Dublin or Cork City Centre for a health assessment, at a time and date that suited them. The assessment was carried out by qualified nurses and took between 2 and 3 hours. In Wave 2, there was no separate health assessment. Instead, the interviewer took two physical measures during the home interview, one of hand grip strength and the other of walking speed. In Wave 3, participants will once more be asked to attend a health centre, for a follow-up health assessment.