Analysed waves of the Longitudinal Study of Australian Children (LSAC) and Millennium Cohort Study (MCS)
| Cohort | Wave | 4–5 years | 6–7 years | 10–11 years | 14–15 years |
| LSAC K | Wave no. | 1 | 2 | 4 | 6 |
| Year | 2004 | 2006 | 2010 | 2014 | |
| N | 4983 | 4464 | 4169 | 3537 | |
| Mean age (years) | 4.8 | 6.8 | 10.8 | 14.9 | |
| Age range (years) | 4–5.6 | 5.9–7.8 | 10–11.7 | 14–15.8 | |
| MCS | Wave no. | 3 | 4 | 5 | 6 |
| Year | 2006 | 2008 | 2012/2013 | 2015/2016 | |
| N | 15 040 | 13 681 | 13 112 | 11 576 | |
| Mean age (years) | 5.2 | 7.2 | 11.2 | 14.3 | |
| Age range (years) | 4.4–6.1 | 6.3–8.1 | 10.2–14 | 13.1–15.3 |
K, Kindergarten cohort.