Table 2 Demographic characteristics of the participants and the number of participants in each institution
|  | Patients with AIS (n = 384) |  | |
|---|---|---|---|
Mean age (SD), years | 14.3 (1.9) | Â | |
Mean body mass (SD), kg | 45.0 (7.2) | Â | |
Mean body height (SD), cm | 155.7 (7.1) | Â | |
Mean body mass index (SD), kg / m2 | 18.5 (2.3) | Â | |
Treatment, n (multiple choices allowed) | 31.0 (12.6) | Â | |
Mean Cobb angle (SD), degrees | 14.3 (1.9) | Â | |
Mean age (SD), years | 45.0 (7.2) | Â | |
Treatment, n (multiple choices allowed) | |||
 Observation | 120 |  | |
 Exercise | 28 |  | |
 Brace | 161 |  | |
 Surgery | 78 |  | |
 Other | 23 |  | |
Institution, n | |||
 Okayama Medical Center | 10 | Shiba Clinic | 14 |
 Aizu Medical Center | 2 | Jikei University Hospital | 20 |
 Iwate Medical University Hospital | 16 | Akita University Hospital | 8 |
 Gifu University Hospital | 17 | Juntendo University Hospital | 26 |
 Kurume University Hospital | 3 | Niigata Spine Surgery Center | 19 |
 University of Miyazaki Hospital | 20 | Niigata University Medical and Dental Hospital | 9 |
 Kanazawa Medical University Hospital | 5 | Gunma Spine Center of Harunaso Hospital | 20 |
 Keio University Hospital | 23 | Sendai Nishitaga Hospital | 20 |
 Hirosaki University Hospital | 14 | Tokai University Hospital | 18 |
 Hirosaki Memorial Hospital | 5 | University of Tokyo Hospital | 26 |
 Saitama Medical University Hospital | 30 | Hamamatsu University Hospital | 20 |
 Saitama Medical Center | 19 | Fukuoka Children’s Hospital | 20 |