Treatment group (retrospection - medical records) - patients diagnosed and / or treated in the Centre of Corrective and Compensatory Gymnastics in Bielsko - Biala, Poland, between 1983 and 1994. Diagnosis: idiopathic scoliosis (IS) - adolescent idiopathic scoliosis (AIS) or early onset idiopathic scoliosis (EOIS) A comparison (control) group: patients with IS, age - and condition - matched, who were diagnosed at the same time, in the same clinic, and by the same physician, and prescribed the same method of physiotherapy, but did not start the exercise treatment.