A randomized clinical trial of 135 youth ( 79 % female ) aged 10 to 17 years diagnosed with chronic migraine ( 15 days with headache/month ) and a Pediatric Migraine Disability Assessment Score ( PedMIDAS ) greater than 20 points were assigned to the CBT plus amitriptyline group ( n = 64 ) or the headache education plus amitriptyline group ( n = 71 ) .