self-determination theory human 5 male 5 Humans 4 Motivation 4 adult 4 controlled study 4 female 4 motivation 4 Cross-Sectional Studies 3 Female 3 Male 3 cross-sectional study 3 questionnaire 3 young adult 3 Adult 2 Cronbach alpha coefficient 2 Personal Autonomy 2 Reproducibility of Results 2 article 2 basic needs 2 gender 2 human experiment 2 intrinsic motivation 2 major clinical study 2 personal autonomy 2 reproducibility 2 satisfaction 2 Adolescent 1 Article 1