Research Article
Validity and Reliability of the Persian Version of Parkinson’s Disease Sleep Scale-2
Table 2
Factor analysis for PDSS-2 in people with idiopathic Parkinson’s disease (n = 456).
| | Items | Factor 1 (PD motor symptoms at night) | Factor 2 (PD symptoms at night) | Factor 3 (sleep disturbances) |
| | Bad sleep quality | — | — | 0.87 | | Difficulties falling asleep | — | — | 0.70 | | Difficulties staying asleep | — | — | 0.76 | | Restlessness of legs or arms at nights | 0.85 | — | — | | Urge to move your legs or arms | 0.84 | — | — | | Distressing dreams at night | — | 0.66 | — | | Distressing hallucinations at night | — | 0.68 | — | | Get up at night to pass urine | 0.64 | — | — | | Uncomfortable and immobility at night | 0.66 | — | — | | Pain in arms or legs | 0.82 | — | — | | Muscle cramps in your arms or legs | 0.83 | — | — | | Painful posturing in the morning | 0.73 | — | — | | Tremor on waking | 0.47 | — | — | | Tired and sleepy after waking in the morning | 0.62 | — | — | | Snoring or difficulties in breathing | — | 0.76 | — |
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