Table 2. The PSQI global score and the prevalence of poor sleep quality among the elderly in the nursing homes stratified by age and gender.

	N	PSQI score Mean (95% CI)	P-value	Poor sleep quality†Prevalence (95% CI)	P-value
Total	817	8.5(8.2, 8.8)		67.3(64.0, 70.5)
Gender
Male	376	8.3(7.8, 8.8)	0.293	66.8(61.7, 71.0)	0.751
Female	441	8.7(8.2, 9.1)		67.8(63.5, 72.1)
Age
60~	135	7.4(6.6, 8.2)	0.010*	54.1(45.9, 63.0)	<0.001*
70~	232	8.4(7.8, 9.1)		64.7(58.6, 70.5)
80~	450	8.9(8.4, 9.3)		72.7(68.7, 77.1)

†Poor sleep quality was determined by PSQI score >5.

*P-value for trend.