Table 4.

Factor Loadings Using the Seven Components of the Pittsburgh Sleep Quality Index Based on a Principal Components Analysis and Varimax Rotation

	Men	Women	Men	Women	Men	Women
	Factor 1		Factor 2		Factor 3
Perceived sleep quality	0.649	0.694
Sleep latency	0.547	0.397			0.653	0.596
Sleep duration	0.849			0.866
Habitual sleep efficiency	0.858			0.731
Sleep disturbances		0.817	0.776
Use of sleeping medications					0.923	0.903
Daytime dysfunction		0.740	0.863

Only factor loadings > 0.32 are listed.