**Overview** This folder contains the datasets as .csv files as well as the HTML results files documenting and annotating our analyses. **Datasets** The *2021-09-17* dataset is the one supporting the manuscript's results section. The *2022-05-02* dataset adds the information about El Escorial uncertainty, genetically-linked disease and Mini Strong Criteria necessary to reproduce the *2022-05-24* results file. **Results files** These may come as HTML or PDF files. The *2021-09-17* results file is the one reported in the manuscript body and Table 3. The *2021-05-02* results file has been wrongly named, it should be *2022-05-02*. It shows the results from the previous file but with the participants whose El Escorial criteria were uncertain due to pure upper or lower motor neuron involvement excluded from the analyses. The *2022-05-24* results file builds on the previous one, excluding participants whose ALS/MND was genetically-linked and applying the *Mini Strong Criteria* instead of the Strong Criteria. The former separate patients into "no cognitive/behavioural impairment", "any cognitive or behavioural impairment without dementia" and "fronto-temporal dementia".