TABLE 2.

Work stress, circadian rhythm and sleep quality of participants

Variables	Score range	M	SD
Sleep quality	0–15	6.75	3.12
Daytime dysfunction	0–3	1.85	.90
Sleep latency	0–3	1.40	.92
Sleep disturbance	0–3	1.29	.72
Subjective sleep quality	0–3	1.28	.67
Sleep duration	0–3	0.56	.67
Habitual sleep efficiency	0–3	0.37	.75
Use of sleep medication	0	0.00	.00
Work stress	35–140	94.36	17.66
Time distribution and work quantity (TDWQ)	1–4	3.07	.64
Nursing specialty and nursing work (NSNW)	1–4	2.84	0.53
Nursing care of patients (NCP)	1–4	2.79	.55
Work environment and equipment (WEE)	1–4	2.60	.71
Management and interpersonal relations (MIR)	1–4	2.30	.65
Circadian rhythm	17–55	34.57	4.83
Circadian rhythm amplitude (LV)	11–30	22.09	3.94
Circadian rhythm stability (FR)	5–25	12.49	3.97

Abbreviations: M, mean; SD, standard deviation.