. 2015 May;30(3):193–202. doi: 10.5001/omj.2015.41

Table 3. Correlation among Pittsburgh Sleep Quality Index (PSQI) component and global scores.

	DISTB	LATEN	DAYDYS	HSE	SLPQUAL	TOTAL
DURAT combined (n=47)	0.04	-0.11	0.25	0.20	0.10	0.33*
NS (n=27)	-0.14	-0.41*	0.18	0.13	0.00	0.20
PS (n=20)	0.21	0.10	0.29	0.28	0.17	0.50*
DISTB combined (n=47)		0.40**	0.45**	0.41**	0.60**	0.59**
NS (n=27)		-0.04	0.24	0.11	0.26	0.29
PS (n=20)		0.62**	0.52*	0.46*	0.70**	0.77**
LATEN combined (n=47)			0.29*	0.56**	0.65**	0.73**
NS (n=27)			-0.14	0.45*	0.11	0.44*
PS (n=20)			0.37	0.54*	0.93**	0.82**
DAYDYS combined (n=47)				0.32*	0.48**	0.66**
NS (n=27)				0.04	0.30	0.53**
PS (n=20)				0.35	0.33	0.65**
HSE combined (n=47)					0.41**	0.71**
NS (n=27)					0.11	0.62**
PS (n=20)					0.47*	0.74**
SLPQUAL combined (n=47)						0.80**
NS (n=27)						0.59**
PS (n=20)						0.82**

*p<0.050 and **p<0.010; NS: Normal sleeper, PS: Poor sleeper, DURAT: Sleep duration; DISTB: Sleep disturbance; LATEN: Sleep latency; DAYDYS: Day dysfunction due to sleepiness; HSE: Sleep efficiency; SLPQUAL: Overall sleep quality. TOTAL represents PSQI component scores of sleep duration disturbance, latency, efficiency, self-reported overall quality and global score, respectively.