Table 3.

Corrected item‐total correlations, exploratory factor analysis, and test‐retest reliability

		Factor Analysis*
		Factors
Item	Item‐Total Correlation	1	2	3	4	Weighted Kappa
1. Sleep during the last week	0.46		0.86			0.63
2. Difficulties falling asleep	0.57		0.48			0.62
3. Difficulties staying asleep	0.50		0.89			0.67
4. Restlessness of legs or arms at night	0.57	0.77				0.69
5. Urge to move your legs or arms	0.61	0.81				0.67
6. Distressing dreams at night	0.46			0.40		0.69
7. Distressing hallucinations at night	0.32			0.81		0.74
8. Get up at night to pass urine	0.39		0.52			0.82
9. Uncomfortable because of immobility	0.58		0.31			0.80
10. Pain in arms or legs	0.54	0.80				0.69
11. Muscle cramps in your arms or legs	0.49	0.67				0.69
12. Painful posturing in the morning	0.57	0.76				0.74
13. Tremor on waking	0.34				0.80	0.66
14. Tired/sleepy in the morning	0.40				0.71	0.72
15. Snoring or difficulties in breathing	0.28			0.79		0.64

^* Principal component factor, promax rotation. Only loads >0.30 are displayed.