In a comprehensive literature survey, (Cooper and Stewart, 2013[i4j) emphasize that children from lower-income households have worse outcomes at later ages for a range of topics such as: scoring lower on tests of cognitive skill in early childhood, being more likely to drop out of school and less likely to attain tertiary education, the evidence being strongest and most abundant. Children from low-income families are also showing more behaviour problems than others. The evidence on physical health, as well as on intermediate outcomes such as parenting and parental mental health is more limited.