Sleep Quality among Female Hospital Staff Nurses

Table 4

Correlation between objective sleep indices and PSQI score.

	PSQI score
	𝛽	𝑟	𝑃
Sleep latency duration (minute)	0.003	0.04	0.59
Stable Sleep ratio (%)	−0.03	0.17	0.03
Unstable Sleep duration	1.26	0.20	0.01
Unstable Sleep ratio (%)	0.05	0.22	0.006
Awake/Dream duration	0.26	0.04	0.58
Awake/Dream ratio (%)	−0.004	0.01	0.89
AHI frequency	0.09	0.25	0.002

PSQI: pittsburgh sleep quality index; CPC: cardiopulmonary coupling analysis; AHI: Apnea-hyponea Index.