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Table 4 One-factor model resulting from the exploratory factor analysis from the unrotated factor structure matrix for the seven PSQI components derived separately from cases with pain-related TMD (N = 496), cases with pain-free TMD (N = 113), and all TMD cases together (N = 609)

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

PSQI component Cases with pain-related TMD Cases with pain-free TMD All TMD cases
1. Subjective sleep quality 0.83 0.88 0.84
2. Sleep latency 0.74 0.73 0.75
3. Sleep duration 0.77 0.64 0.74
4. Habitual sleep efficiency 0.52 0.47 0.51
5. Sleep disturbances 0.76 0.82 0.78
6. Use of sleep medication 0.56 0.04 0.56
7. Daytime dysfunction 0.58 0.71 0.62