[Retracted] The Effect of Symptom Clusters and Sleep Disorder on Quality of Life among Patients with Chronic Obstructive Pulmonary Disease

Table 3

Exploratory factor analysis using ratings of symptom severity (n = 223).

Symptoms	Factor 1	Factor 2	Factor 3
	Respiratory functional cluster	Emotional cluster	Fatigue-sleep cluster
Shortness of breath	0.712
Dry mouth	0.643
Cough	0.799
Feeling bloated	0.637
Problems with sexual interest or activity	0.615
Feeling nervous		0.694
Feeling sad		0.701
Feeling irritable		0.687
Worrying		0.753
I do not look like myself		0.644
Lack of energy			0.733
Feeling drowsy			0.684
Difficulty sleeping			0.772
Cronbach’s α coefficients	0.854	0.841	0.847
Eigenvalue	3.31	3.54	2.87
Explained variance	2.01	2.17	1.85
Explained (%)	43.73	47.28	39.64
Cumulative (%)	28.82	21.40	39.60
Kaiser–Meyer–Olkin		0.885
Bartlett sphericity test		<0.001