Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Interventional
Official Title: Psychological and Motor Effects of Testosterone Therapy in Adolescents With XXY/Klinefelter Syndrome
Brief Summary: The purpose of this study is to determine if testosterone replacement therapy leads to changes in psychological factors and/or motor skills in adolescent males with 47,XXY (also called Klinefelter syndrome). This study will also evaluate whether certain genetic factors of the X chromosome affect the psychological or motor features of XXY/Klinefelter syndrome.