Labor (2) Psychology (2) Estudio (2) Psicología (2) Trabajo (2) Minors (1) Youth (1) Worry (1) Weights and measures (1) Vitality (1) Utility theory (1) Trials (1) Surveys (1) Students (1) Stress (Psychology) (1) Reading (1) Problem solving (1) Population (1) Music (1) Measurement (1) Life (1) Health (1) Good and evil (1) Emotions (1) Design (1) Anxiety (1) Utilidad (Economía) (1) Encuestas (1) Salud (1) Vitalidad (1)