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Table 1 Information on data harmonisation across datasets
| Concept measured | TILDA | Mitchelstown Cohort Study | Harmonisation method |
|---|---|---|---|
| PA | IPAQ – Self-reported weekly minutes of moderate and vigorous PA | IPAQ – Self-reported weekly minutes of moderate and vigorous PA | Weekly minutes of moderate and vigorous PA were summed. Participants were categorised as meeting/not meeting PA guidelines and divided into tertiles of weekly minutes of MVPA within each study and across the integrated dataset |
| Depression | CES-D (continuous score) | CES-D (continuous score) | Participants with CES-D scores of ≥16 were classified as at-risk for depression |
| Age | Age reported for 50–79 years (ages < 50 reported as 49; ages > 79 were reported as 80) | Age (5 year categories) | Divided into 10 year categories |
| Sex | Female and male | Female and male | Females and males grouped |
| BMI | BMI (categorical) calculated from nurse measured height weight | BMI (continuous) calculated from measured height weight | Split into underweight, normal weight, overweight, and obese using standard cut-offs |
