The analysis is based on the 1983-1984 cohorts which are made up of children who had reached the age of 10 by the time the NLSCY was conducted. ###>L'analyse repose ici sur les cohortes de 1983 et 1984, où se trouvent les enfants qui avaient atteint l'âge de 10 ans au moment du premier cycle de l'ELNEJ.