Table 1.
Participant Demographics, [11C]PiB PET, and Sleep Characteristics
| Demographics (Baseline, n = 32) | |
| Age, years | 75.5 ± 4.3 |
| Female, n (%) | 23 (72) |
| Education, years | 17.0 ± 1.5 |
| MMSE | 29.0 ± 1.0 |
| ApoE e4 carriers, n (%) | 15(47) |
| [11C]PiB PET Scans | |
| PiB+ at baseline, n (%) | 20 (63) |
| No. of PiB scans (range) | 2.6 (2–5) |
| PiB interval, years | 3.7 ± 2.4 |
| Sleep Characteristics | |
| TST, min | 335.3 ± 70.9 |
| NREM S1 time, min | 29.7 ± 13.8 |
| NREM S2 time, min | 176.4 ± 59.4 |
| NREM SWS time, min | 64.3 ± 44.6 |
| REM time, min | 64.8 ± 27.5 |
| Sleep-onset latency, min | 24.8 ± 36.9 |
| Persistent-sleep latency, min | 37.4 ± 43.2 |
| WASO, min | 110.2 ± 61.5 |
| Sleep efficiency, % | 69.9 ± 14.8 |
| Apnea-hypopnea index | 7.3 ± 9.4 |
| No. of arousals | 48.5 ± 27.4 |
| Arousal index | 8.7 ± 5.5 |
| PSQI global score | 4.1 ± 2.1 |
All values are mean ± SD unless otherwise noted. PiB status was determined based on a global PiB DVR threshold of 1.065 [11]. MMSE, Mini-Mental State Examination; TST, total sleep time; NREM, non-rapid eye movement sleep; SWS, slow-wave sleep; S1/S2, stage 1/stage 2; REM, rapid eye movement sleep; WASO, wake after sleep onset; PSQI, Pittsburgh Sleep Quality Index.