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Table 3 Polychoric correlation matrices for the seven PSQI components in cases with pain-related TMD and cases with pain-free TMD are shown in the lower left triangle area, and the upper right triangle area, respectively

From: Exploration of dimensionality and psychometric properties of the Pittsburgh Sleep Quality Index in cases with temporomandibular disorders

PSQI component 1. 2. 3. 4. 5. 6. 7.
1. Subjective sleep quality   0.54 0.55 0.26 0.74 0.06 0.54
2. Sleep latency 0.57   0.39 0.32 0.53 0.35 0.33
3. Sleep duration 0.58 0.46   0.26 0.28 0.01 0.34
4. Habitual sleep efficiency 0.33 0.36 0.51   0.26 -0.18 0.23
5. Sleep disturbances 0.64 0.47 0.45 0.17   -0.12 0.58
6. Use of sleep medication 0.32 0.36 0.30 0.12 0.39   -0.07
7. Daytime dysfunction 0.39 0.28 0.32 0.14 0.42 0.31