Table 2.

Descriptive statistics for components, global PSQI (n = 263).

Variables	Mean	SD	Range
1.Subjective sleep quality	2.6 relatively difficulty	1.1	0–3
2.Sleep latency	1.7	0.9	0–3
3.Sleep duration	2.5 relatively difficulty	1.1	0–3
4.Sleep efficiency	3 significant difficulties	1.2	0–3
5.Sleep disturbances	1.4	0.9	0–3
6.Day-time dysfunction	1.2	0.7	0–3
7.Sedative usage	1.1	0.1	0–3
A global score	6.00	2.1	1–19
*Sleep efficiency (%).	45.2%	10.2	0–100

Mean ± SD are shown.

PSQI = Pittsburgh Sleep Quality Index.

^*Calculate the habitual sleep efficiency with the following equation: (Hours slept [#1]/h spent in bed [result above])*100 = habitual sleep efficiency (in %).