Table 2.
Sleep Characteristic Comparisons by Reproductive Stage
| Characteristic | Total sample (n = 71) |
Late premenopausal (n = 50) |
Early perimenopausal (n = 21) |
Statistic, p-value |
|---|---|---|---|---|
| Mean ± SD | Mean ± SD | Mean ± SD | ||
| PSQI | ||||
| Global score (0–21) | 6.4 ± 3.1 | 6.5 ± 3.3 | 6.1 ± 2.6 | NS d = 0.13 |
| Poor global sleep quality (>5), n (%) | 40 (56) | 27 (54) | 13 (62) | NS Ф = 0.091 |
| Component 1 quality (0–3) | 1.1 ± 0.74 | 1.0 ± 0.72 | 1.3 ± 0.75 | NS d = 0.27 |
| Component 2 onset latency (0–3) | 1.1 ± 0.83 | 1.1 ± 0.78 | 1.1 ± 0.99 | NS d = 0.000 |
| Component 3 duration (0–3) | 1.0 ± 0.68 | 0.9 ± 0.66 | 1.1 ± 0.74 | NS d = 0.29 |
| Component 4 efficiency (0–3) | 0.4 ± 0.79 | 0.5 ± 0.88 | 0.2 ± 0.43 | NS d = 0.43 |
| Component 5 disturbance (0–3) | 1.4 ± 0.55 | 1.5 ± 0.58 | 1.2 ± 0.38 |
t = 2.2, p = 0.034 d = 0.61 |
| Component 6 sleep medication (0–3) | 0.4 ± 0.87 | 0.4 ± 0.91 | 0.3 ± 0.77 | NS d = 0.12 |
| Component 7 daytime dysfunction (0–3) | 1.0 ± 0.72 | 1.1 ± 0.70 | 0.8 ± 0.77 | NS d = 0.41 |
| Actigraphy | ||||
| Time in bed (hours) | 7.9 ± 1.1 | 7.9 ± 1.1 | 7.8 ± 1.1 | NS d = 0.09 |
| Sleep duration (hours) | 7.0 ± 1.2 | 7.1 ± 1.1 | 6.8 ± 1.4 | NS d = 0.24 |
| Sleep efficiency (%) | 89.2 ± 10.4 | 89.7 ± 9.5 | 87.8 ± 12.2 | NS d = 0.17 |
| Sleep onset latency (minutes) | 11.7 ± 7.6 | 11.7 ± 7.0 | 11.6 ± 9.1 | NS d = 0.01 |
| Number of awakenings | 13 ± 8.3 | 12 ± 8.2 | 15 ± 8.5 |
t = 2.00, p = 0.055 d = 0.37 |
| Wake after sleep onset (%) Median | 9.0 ± 11.2 5 |
8.2 ± 10.8 4 |
11.1 ± 12.1 6 |
NS d = 0.26 MWU p = 0.080 |
| Recline/sleep | ||||
| Weekdays (hours) | 7.3 ± 1.3 | 7.4 ± 1.3 | 7.0 ± 1.2 | NS d = 0.32 |
| Weekends (hours) | 8.0 ± 1.4 | 8.0 ± 1.4 | 7.8 ± 1.6 | NS d = 0.13 |
MWU, Mann–Whitney U; PSQI, Pittsburgh Sleep Quality Index.