Descriptive data on school-level exposures
| Variable | Categories | Mean (SD) | N (%) |
| School-level strong boundaries | – | −0.28 (0.46) | – |
| School-level student commitment | – | 36.5 (0.47) | – |
| School-level student belonging | – | 30.0 (1.09) | – |
| School level value added | – | 0.09 (1.01) | – |
| School size | Small | 1189 (326.34) | 11 (55) |
| Large | 9 (45) | ||
| School neighbourhood deprivation | Low score | 0.27 (0.20) | 10 (50) |
| High score | 10 (50) | ||
| Free school meal eligibility | Low score | 0.35 (0.19) | 10 (50) |
| High score | 10 (50) | ||
| High affluence | – | 1415 (63.23) |