Diagnostic tests with positive family history but normal molecular results
| Case No | Age (y)—sex | Clinical status | EMG | Diagnosis |
| 1 | Newborn—F | Equivocal | — | — |
| 2 | 17—M | Equivocal | — | — |
| 3 | 18—F | Equivocal | — | — |
| 4 | 20—F | Equivocal | — | — |
| 5 | 26—F | Equivocal | — | — |
| 6 | 40—F | Symptomatic | Normal | — |
| 7 | 41—M | Symptomatic | Myotonia | PROMM |
| 8 | 63—M | Symptomatic | Myotonia | PROMM |
| 9 | 57—F | Equivocal | — | — |
F = female; M = male; EMG, electromyography; PROMM, proximal myotonic myopathy.