Table 3.

Relationship between sleep quality and its various dimensions, coping styles and psychological distress among psychiatric nurses (n = 812, Shandong, China).

	Psychological distress	Positive coping style	Negative coping style	Sleep quality (PSQIT)	Subjective sleep quality	Sleep latency	Sleep persistence	Habitual sleep efficiency	Sleep disorder	Use hypnotic drugs	Daytime dysfunction
Psychological distress	1
Positive coping style	−0.155**	1
Negative coping style	0.266**	0.174**	1
Sleep quality (PSQIT)	0.532**	−0.177**	0.137**	1
Subjective sleep quality	0.456**	−0.164**	0.118**	0.782**	1
Sleep latency	0.371**	−0.163**	0.133**	0.715**	0.575**	1
Sleep persistence	0.318**	−0.083*	0.053	0.700**	0.426**	0.359**	1
Habitual sleep efficiency	0.158**	−0.05	−0.027	0.524**	0.221**	0.202**	0.541**	1
Sleep disorder	0.420**	−0.133**	0.111**	0.649**	0.502**	0.434**	0.277**	0.126**	1
Use hypnotic drugs	0.212**	−0.044	0.090*	0.449**	0.265**	0.187**	0.175**	0.128**	0.240**	1
Daytime dysfunction	0.447**	−0.146**	0.147**	0.650**	0.490**	0.374**	0.231**	0.061	0.449**	0.290**	1

PSQIT-The total score of the Pittsburgh sleep quality index;

^**P < 0.01,

^*P < 0.05.