Relationship between age and motor dark line
| Motor Dark Line | ALS | Control | Mean Age (y) | SD |
|---|---|---|---|---|
| Absent | 19(76) | 17(81) | 47.39 | 12.28 |
| Present | 6(24) | 4(19) | 56.90 | 13.44 |
Note.—Observers 1 and 2 had identical interpretations. Numbers in parentheses are percentages. P = .039.