In
particular, population - level studies that capture children's developmental health and well - being as well as associated social and contextual assets from the child perspective, and
at representative population levels do not exist — despite the
fact that middle childhood represents a developmental period that is particularly apt for prevention and intervention efforts that target actionable factors in children's multiple environments: social relationships
at home,
school and community; sleep and nutrition habits;
school experiences; and after -
school time use.