Table 3.

Correlations between sleep measures and relevant variables.

PSQI component	Depression	Anxiety	Stress	HRQoL	HRQoL
				(PHS)	(MHS)
Subjective sleep quality	0.426**	0.354**	0.317**	−0.301**	−0.439**
Sleep latency	0.319**	0.306**	0.255**	−0.236**	−0.332**
Sleep duration	0.266**	0.222**	0.177**	−0.211**	−0.329**
Habitual sleep efficiency	0.143**	0.130*	0.107*	−0.116*	−0.209**
Sleep disturbance	0.267**	0.219**	0.264**	−0.260**	−0.302**
Use of sleep medication	0.157*	0.179**	0.042	−0.065	−0.110*
Daytime dysfunction	0.456**	0.336**	0.316**	−0.334**	−0.455**
Total score of the PSQI	0.486**	0.409**	0.360**	−0.369**	−0.526**

^*p < 0.05;

^**p < 0.01.

MHS, mental health summary score; PHS, physical health summary score; PSQI, Pittsburgh Sleep Quality Index.