Table 4.

Correlation between PSQI sub-component scores and DASS-21 sub-component score in dementia caregivers

PSQI component	DASS-21 Depression	DASS-21 Anxiety	DASS-21 Stress
PSQI Global Score	0.24*	0.28*	0.41**
Subjective sleep quality	0.30*	0.20	0.36*
Sleep latency	0.26*	0.18	0.30*
Sleep duration	−0.11	−0.06	0.02
Sleep efficiency	0.07	−0.01	0.22
Sleep disturbances	0.21	0.30*	0.29*
Use of sleeping medication	0.03	0.29*	0.24*
Daytime dysfunction	0.48**	0.33*	0.40**

*p < 0.05, **p < 0.001