Clinical characteristics of a family with paralysis periodica paramyotonica
| Patient | Age (y) | Age at onset | Number of episodes /month | Duration of each episode | Paramyotonia/ Paradoxical myotonia | Precipitating factors of periodic paralysis |
| I-1 | 68 | 9 y | 3–4 | 7–10 d | +/+ | RAE, cold, fasting, water melon |
| II-1 | 38 | 7 y | 2 | 5–7 d | +/+ | RAE, cold, fasting, water melon |
| II-3 | 35 | 7 y | 2–3 | 2–3 d | +/+ | Cold, fasting, pregnancy, stress |
| II-6 | 30 | 8 y | 1 | 1–2 d | +/− | Cold, fasting |
| III-1 | 4 | 4 months | 3–4 | <2 h | +/− | Fasting |
| III-2 | 11 | 1 y | 3–4 | <2 h | +/− | RAE, fasting |
| III-3 | 7 | 2 months | 4–5 | <2 h | +/− | RAE, fasting, sleeping |
RAE=Rest after exercise; cold=cold exposure; −=no abnormal findings in each item of clinical evaluation.