Table 3.

Comparison of sleep quality before and after operation (x̅±sd)

Group	Time	Scores of falling asleep time	Scores of sleep time	Scores of sleep efficiency	Scores of sleep disorder
Control group (n=439)	On admission	3.4±0.3	2.7±0.4	2.3±0.6	2.4±0.4
	1 day before operation	3.4±0.5	2.7±0.4	2.3±0.5	2.4±0.2
	At discharge	3.3±0.5	2.6±0.8	2.2±0.9	2.3±0.8
Observation group (n=439)	On admission	3.4±0.3	2.7±0.3	2.3±0.4	2.4±0.5
	1 day before operation	3.1±0.4***,###	2.5±0.4***,###	2.2±0.5***,###	2.3±0.6***,###
	At discharge	3.1±0.2***,###	2.4±0.3***,###	2.1±0.4***,###	2.2±0.5***,###

Note: Comparison with the scores on admission in the same group;

^***P<0.001.

Comparison with the control group;

^###P<0.001.