Table 2.
Overview of Wales and Australian health data sets
| Characteristics | Data sets and location | ||||
| WECC (Wales) | MCS (Wales) | PLAYCE (AU) | ORIGINS (AU) | LSAC (AU) | |
| Age | 0–17 | 5–14 | 2–9 | 1–3 | 8–17 |
| Sample size | 1.3 million* | 1699–2181 | 2028 | 2036 | 3645 |
| Time points (n) | Dynamic | 4 | 3 | 2 | 5 |
| Collection years | 1990–ongoing† | 2006–2015 | 2015–2022 | 2018–2022 | 2008–2018 |
| BMI | ✓ | ✓ | ✓ | ✓ | ✓ |
| Physical activity | ✕ | ✓ | ✓ | ✓ | ✓ |
| Sedentary time | ✕ | ✓ | ✓ | ✓ | ✓ |
| Diet | ✕ | ✓ | ✓ | ✓ | ✓ |
| Confounders | ✓ | ✓ | ✓ | ✓ | ✓ |
| Geolocation | Home, school | Home, school | Home, childcare, school | Home | Home |
*Cohort size for the analyses will be smaller (as described).
†As this is routine data it is continually collected; however, the observation period for analysis will be selected on availability of data.
AU, Australia; BMI, body mass index; LSAC, Longitudinal Study of Australian Children; MCS, Millennium Cohort Study; PLAYCE, PLAY Spaces and Environments for Children’s Physical Activity; WECC, Wales Electronic Cohort for Children.