Table 2.
Subjective sleep quality measures [mean values (standard deviations)] for young and older adults.
| Young | Older | |
|---|---|---|
| PSQI | ||
| Sleep duration (h) | 8.02** (1.18) | 6.92 (1.05) |
| Sleep latency (min) | 23.59 (20.45) | 23.34 (26.87) |
| St Mary’s Hospital sleep questionnaire | ||
| Sleep duration (h) – day 1 | 8.08** (1.21) | 7.13 (1.11) |
| Sleep latency (min) – day 1 | 29.69 (31.81) | 22.44 (26.68) |
| Sleep duration (h) – day 7 | 7.9** (0.84) | 7 (1.05) |
| Sleep latency (min) –day 7 | 25.5 (20.38) | 22.25 (30.77) |
| Sleep diariesa | ||
| Sleep duration (h) | 7.98*** (0.7) | 6.73 (0.71) |
| Sleep latency (min) | 20.57 (14.33) | 21.59 (18.84) |
| Number of intra-sleep awakenings | 0.31*** (0.37) | 1.27 (0.68) |
| Duration of intra-sleep awakenings (min) | 3.94*** (7.6) | 35.44 (30.32) |
| Naps duration (min) | 1.2 (4.28) | 10.91 (21.44) |
| Sleep qualityb | 3.86 (0.65) | 3.7 (0.65) |
| Morning alertnessb | 3.43 (0.81) | 3.87 (0.71) |
| Sleep depthb | 3.91 (0.68) | 3.53 (0.68) |
| Early awakeningb | 9.89 (0.67) | 3.91 (0.7) |
| Ease to wake-upb | 2.64 (0.62) | 1.73*** (0.77) |
| Ease to fall asleep | 2.16 (0.7) | 2.12 (0.87) |
| Dreams quantityb | 2.35 (0.91) | 1.74 (1.03) |
Sleep duration and sleep latency were assessed with the St Mary’s Hospital sleep questionnaire on day 1 of testing and on day 7 of testing.
a
Averaged measures during the 7 days are presented in the table for sleep diaries.
b
Ordinal variables on a Likert-scale ranging from 1 to 5. Significant between-group differences: ***p ≤ 0.001; **p < 0.01.