Exercise (8) enfant (6) Children (6) Children (6) temps (durée) (5) âge (5) Time (5) Human beings (5) Age (5) Age (5) Models (5) adolescent (5) association (4) Social groups (4) Regression analysis (4) Average (4) saison (3) éducation (3) Education (3) Variation (3) Teenagers (3) Ci (Chinese poetry) (3) Sex (3) Education (3) Older people (3) jeunesse (2) poids (2) établissement scolaire (2) mode de vie (2) analyse (2)