Demographics for all diagnostic groups, only including those who laughed
| Controls (91) | AD (11) | bvFTD (22) | nfvPPA (12) | svPPA (14) | rtFTD (8) | |
| % female* | 68.5 | 54.8 | 40.9 | 50.0 | 28.6 | 62.5 |
| % R handed | NA | 90.9 | 90.9 | 100.00 | 94.7 | 92.9 |
| Age | 60.9±9.9 | 58.8±5.3 | 60.8±5.1 | 66.7±11.5 | 65.6±6.7 | 66.7±3.0 |
| Education | NA | 16.2±3.0 | 16.3±3.6 | 16.8±1.8 | 16.8±2.4 | 16.7±2.9 |
| MMSE | NA | 22.5±4.8 | 24.6±5.1 | 24.3±9.8 | 23.3±4.2 | 26.6±2.6 |
| Syllable count * | 840.0±356.5 | 496.5±215.9 | 472.3±320.8 | 476.2±298.0 | 699.3±324.9 | 734.1±334.7 |
AD, Alzheimer's disease; bvFTD, behavioural variant frontotemporal dementia; MMSE, Mini-Mental State Exam; nfvPPA, non-fluent variant primary progressive aphasia; rtFTD, right temporal variant frontotemporal dementia; svPPA, semantic variant of primary progressive aphasia. The asterisk signifies a between-group difference with p < 0.05.