Table 1 Cross-sectional response and attrition rate for the included waves, age groups and cohorts
| Â | Wave 1 (2004) | Wave 4 (2010) | Wave 5 (2012) | Wave 6 (2014) | Wave 7 (2016) |
|---|---|---|---|---|---|
B cohort | |||||
 Age group (years) | 0–1 | – | – | 10–11 | 12–13 |
 aAttrition rate (%) | – | – | – | 26.3 | 33.8 |
 Study child, male (n) | – | – | – | 1929 | 1734 |
 Total (n) | 5107 | – | – | 3764 | 3381 |
K cohort | |||||
 Age group (years) | 4–5 | 10–11 | 12–13 | 14–15 | 16–17 |
 aAttrition rate (%) | – | 16.3 | 20.6 | 29.0 | 38.0 |
 Study child, male (n) | – | 2132 | 2020 | 1798 | 1576 |
 Total (n) | 4983 | 4169 | 3956 | 3537 | 3089 |