association (2) Students (2) Social groups (2) Manufacturers' agents (2) Commission merchants (2) Students (2) Gender (2) poids (1) état (1) risque (1) besoin (1) mode de vie (1) intérêts (1) éducation (1) âge (1) situation de famille (1) Brésil (1) Education (1) Composition (1) Article (1) Methods (1) Programs (1) Teenagers (1) Work (1) Ci (Chinese poetry) (1) Self-perception (1) Risk (1) Population (1) Perception (1) Percentage (1)