Table 1.
Clinical Characteristics of 2,161 Patients with Childhood Onset Myasthenia Gravis in the Retrospective Study
| Characteristics | Patients, n (%) | F/M |
|---|---|---|
| Age at onset | ||
| 0–4 years | 936 (43.31) | 524/412 |
| 4–14 years | 1,225 (56.69) | 576/649 |
| Osserman criteria | ||
| I | 1,927 (89.17) | 978/949 |
| IIa | 125 (5.78) | 66/59 |
| IIb | 94 (4.35) | 51/43 |
| III | 11 (0.51) | 2/9 |
| IV | 4 (0.19) | 3/1 |
| Thymus abnormality | ||
| Thymoma | 48 (2.22) | 22/26 |
| Hyperplasia | 254 (11.75) | 139/115 |
| Normal | 1,859 (86.02) | 982/877 |
| Thymectomized patients | 45 (2.08) | 22/23 |
| Hyperthyroidism | 94 (4.35) | 50/44 |
F, female; M, male.