Table 1.
Demographics, PET, and sleep summary information (mean ± SD)a
| Variable | EEG subjects (n = 31) | Questionnaire subjects (n = 95) |
|---|---|---|
| Age (yr) | 75.7 ± 4.6 | 77.8 ± 6.7 |
| N (%) female | 24 (77%) | 56 (59%) |
| Education (yr) | 16.6 ± 1.8 | 17.0 ± 1.8 |
| Mini-Mental State Examination | 29.0 ± 1.0 | 28.7 ± 1.4 |
| PiB status (%) | PiB− 12 (39%); PiB+ 19 (61%); | PiB− 55 (56%); PiB+ 39 (41%) |
| FTP Braak staging (%) | Braak 0: 6 (19%); Braak I/II: 18 (61%); Braak III/IV: 7 (23%) | Braak 0: 22 (23%); Braak I/II: 60 (63%); Braak III/IV: 13 (14%) |
| Total sleep time (min) | 343 ± 61 | — |
| NREM S2 time (min) | 176 ± 57 | — |
| NREM SWS time (min) | 71 ± 49 | — |
| REM time (min) | 68 ± 24 | — |
| WASO (min) | 111 ± 74 | — |
aPiB status was determined based on a DVR threshold of 1.065 (Villeneuve et al., 2015). FTP Braak staging, indexing the progression of tau pathology, was assigned to 1 of 4 stages based on FTP uptake in Braak-based composite regions, as described previously (Maass et al., 2017).