Clinical classification of patients with and without ALS
| FTD only (N=611) | ALS/FTD (N=89) | χ2 | p Value | |
|---|---|---|---|---|
| N (%) | N (%) | |||
| bvFTD | 307 (50.2) | 70 (78.7) | 25.22 | <0.001*** |
| SD | 90 (14.7) | 3 (3.4) | 8.70 | 0.004** |
| PNFA | 111 (18.2) | 1 (1.1) | 16.79 | <0.001*** |
| bvFTD/SD | 70 (11.5) | 10 (11.2) | 0.004 | 1.00 |
| bvFTD/PNFA | 31 (5.1) | 5 (5.6) | 0.047 | 1.00 |
| bvFTD/SD/PNFA† | 2 (0.3) | 0 (0) | – | 1.00 |
**p<0.01 ***p<0.001.
†Fisher’s exact statistic used as expected cell counts below 5.
ALS, amyotrophic lateral sclerosis; bvFTD, behavioural form of FTD; FTD, frontotemporal dementia; PNFA, progressive non-fluent aphasia; SD, semantic dementia.