Researchers quizzed nearly 5,100 children in the three final years of primary school in 69 schools in Flemish Brabant Province.
Psychologist Patrick Luyten puts the figure into context: "We live in a country with a high living standard that offers children many opportunities to develop."
The research fails to come up with a clear link between the feeling of happiness and factors within the child's home e.g. divorced parents or the language spoken in the home.
427 children awarded themselves a figure of 5 or less. Patrick Luyten believes this result is partly due to genetic factors as well as social factors. Children who are pestered are often unhappy. Fear of failure is also a major reason why children feel unhappy.