Correlation of depression and PSQI for elderly and young control.

Table 4: Correlation of depression and PSQI for elderly and young control.

			Global PSQI	Component 1	Component 2	Component 3	Component 4	Component 5	Component 6	Component 7
GDS	Control group	r	0.634	-0.290	0.624	0.182	0.328	0.571	0.307	0.367
	Control group	p	< 0.001	0.057	< 0.001	0.237	0.030	< 0.001	0.043	0.014
	Geriatric group	r	0.570	0.568	0.526	0.238	0.352	0.408	-0.203	0.270
	Geriatric group	p	< 0.001	< 0.001	< 0.001	0.036	0.002	< 0.001	0.075	0.017

GDS: Geriatric depression score; PSQI: Pitsburg sleep quality index; Component 1: Subjective sleep quality; Component 2: Sleep latency; Component 3: Sleep duration; Component 4:

Habitual sleep efficiency; Component 5: Sleep disturbances; Component 6: Use of sleeping medication; Component 7: Daytime dysfunction.