Table 2.

PSQI internal consistency data.

PSQI component	Corrected item-total correlation
Subjective sleep quality	0.702
Sleep latency	0.497
Sleep duration	0.462
Habitual sleep efficiency	0.380
Sleep disturbance	0.414
Sleep medication use	0.131
Daytime dysfunction	0.469
Cronbach's α	0.719

PSQI, Pittsburgh Sleep Quality Index.