Table 5.

Corresponding factor loadings obtained by confirmatory factor analysis for the emerging four-domain structure obtained by principal component analysis of 134 European patients with chronic rhinosinusitis

Item number	Item wording	Domain
		Nasal symptoms	Otologic symptoms	Sleep symptoms	Emotional symptoms
1	Need to blow your nose	0.85
2	Sneezing	0.65
3	Running nose	0.71
4	Cough	0.74
5	Post-nasal discharge*	0.47
6	Thick nasal discharge*	0.48
7	A feeling of full or stuffed ear		0.80
8	Dizziness or vertigo		0.70
9	Earache		0.66
10	Facial pain or pressure*	0.47
11	Difficulty sleeping			0.84
12	Wake up in the middle of the night			0.87
13	Lack of a good night’s sleep			0.95
14	Wake up tired			0.73
15	Fatigued or tired during the day			0.75
16	Reduced productivity				0.89
17	Reduced concentration				0.78
18	Frustrated, restless or irritated				0.84
19	Sadness				0.53
20	A feeling of shame				0.69
21	Difficulty to feel ‘smells’ or ‘tastes’	0.63
22	Stuffed nose	0.74

*Item with low factor loading < 0.5