Table 2.
Descriptive statistics of the subjective sleep questionnaire scores.
| Obtainable scores | Mean (SD) | Good sleepers | Moderate sleepers | Poor sleepers | |
|---|---|---|---|---|---|
| Scores (percentage of participants) | |||||
| PSQI | 0–9 | ||||
| All participants | 2.99 (1.57) | 0–1 (15.3%) | 2–4 (66.4%) | 5–8 (18.3%) | |
| Study 2 | 2.54 (1.29) | ||||
| AIS | 0–24 | ||||
| All participants | 3.98 (2.66) | 0–2 (35%) | 3–6 (50%) | 7–17 (15%) | |
| Study 2 | 3.41 (2.09) | ||||
| GSQS | 0–14 | ||||
| Study2 | 2.86 (2.87) | 0–1 (40%) | 2–7 (53%) | 8–13 (7%) | |
| Sleep dairy | 0–12 | ||||
| Study 2 | 1.38 (1.22) | 0–1 (60%) | 2–5 (40%) | ||
Note: PSQI = Pittsburgh Sleep Quality Index, AIS = Athens Insomnia Scale, GSQS = Groningen Sleep Quality Scale.