Students (2) puits (1) état (1) enseignement secondaire (1) établissement scolaire (1) échantillonnage (1) recherche (1) indicateur (1) âge (1) point (1) public (1) Education (Secondary) (1) Instruments (1) Teenagers (1) Taxicabs (1) Social skills (1) Sex differences (1) Sex (1) Sampling (1) Research (1) Psychology (1) Performance (1) Mothers (1) Mother and child (1) Mexican students (1) Human behavior (1) High school students (1) Families (1) Education, Secondary (1) Education, Primary (1)