Table 2.
Sleep stage scoring on the prospective memory and control nights in relation to aging
| Prospective memory night | Control night | Inferential statistics | |||||
|---|---|---|---|---|---|---|---|
| Adults <30 |
Adults ≥30 | Adults <30 |
Adults ≥30 | Age correlation | Inter-night correlation | Night effect | |
| Total sleep time (min) | 511.50 ± 44.80 | 426.49 ± 64.48 | 513.08 ± 41.35 | 428.63 ± 67.00 | r(74) = −.65, p < .001 | Average ICC = .81, p < .001 | p = .74 |
| Sleep efficiency (%) | 92.02 ± 4.81 | 82.94 ± 10.73 | 93.20 ± 4.28 | 83.34 ± 11.46 | r(74) = −.58, p < .001 | Average ICC = .74, p < .001 | p = .67 |
| Sleep onset latency (min) | 17.66 ± 14.26 | 14.79 ± 12.41 | 13.29 ± 6.78 | 17.87 ± 22.90 | r(74) < .01, p = .97 | Average ICC = .37, p = .03 | p = .68 |
| Wake after sleep onset (min) | 26.88 ± 20.87 | 72.03 ± 53.36 | 24.62 ± 25.49 | 69.80 ± 55.35 | r(74) = .59, p < .001 | Average ICC = .67, p < .001 | p = .87 |
| N1 (min) | 26.39 ± 20.17 | 48.32 ± 34.58 | 24.86 ± 19.78 | 37.84 ± 19.00 | r(74) = .43, p < .001 | Average ICC = .86, p < .001 | p = .10 |
| N2 (min) | 296.28 ± 43.65 | 230.62 ± 59.41 | 300.81 ± 38.24 | 238.41 ± 51.03 | r(74) = −.60, p < .001 | Average ICC = .71, p < .001 | p = .73 |
| SWS/N3 (min) | 78.36 ± 19.78 | 67.01 ± 40.78 | 81.14 ± 22.17 | 70.32 ± 35.63 | r(74) = −.27, p = .02 | Average ICC = .79, p < .001 | p = .50 |
| REM (min) | 110.46 ± 24.97 | 79.38 ± 36.25 | 106.38 ± 22.24 | 81.98 ± 31.68 | r(74) = −.52, p < .001 | Average ICC = .75, p < .001 | p = .41 |
| Apnea–Hypopnea Index events/h | 0.39 ± 0.91 | 4.99 ± 6.23 | 0.36 ± 0.49 | 4.84 ± 4.77 | r(74) = .60, p < .001 | Average ICC = .77, p < .001 | p = .74 |
Descriptive data are provided using an age group cutoff of 30 years old, but correlational data relate chronological age as a continuous variable to sleep variables. Sleep variables correlated strongly across the two experimental nights (measured by intraclass correlation [ICC]) and did not differ by condition. Data were missing/corrupted for two control nights.