The Pittsburgh Sleep Quality Index: Reliability, Factor Structure, and Related Clinical Factors among Children, Adolescents, and Young Adults with Chronic Pain
Table 1
Descriptive statistics and internal consistency (Cronbach’s ) of the PSQI components and correlations among them.
Pearson’s correlation ()
PSQI components
Mean (SD)
Cronbach’s if item deleted
1
2
3
4
5
6
1. Subjective sleep quality
1.38 (0.74)
0.67
—
2. Sleep latency
1.82 (0.91)
0.70
.44
—
3. Sleep duration
0.53 (0.77)
0.69
.41
.27
—
4. Habitual sleep efficiency
0.64 (0.97)
0.70
.33
.33
.62
—
5. Sleep disturbances
1.37 (0.61)
0.71
.47
.26
.22
.21
—
6. Use of sleeping medication
0.68 (1.11)
0.75
.31
.30
.11
.18
.17
—
7. Daytime dysfunction
1.25 (0.92)
0.71
.45
.24
.32
.17
.40
.21
Pittsburgh Sleep Quality Index; correlation significance: , (2-tailed). Cronbach’s for all seven components is 0.74.
