Many children labeled indigo by their parents are diagnosed with attention-deficit hyperactivity disorder (ADHD) and Tober and Carroll's book The Indigo Children linked the concept with diagnosis of ADHD.
Banyak anak yang dilabeli indigo didiagnosis mengidap attention-deficit hyperactivity disorder (ADHD), dan buku Tober dan Carroll yang berjudul The Indigo Children sendiri menghubungkan konsep indigo dengan diagnosis ADHD.