Table 2. Exploratory Factor Analysis Using Ratings of Symptom Occurrence Prior to Breast Cancer Surgery^a.

Symptom	Factor 1	Factor 2	Factor 3	Factor 4
	Irritability Symptom Cluster	Pain/Discomfort Symptom Cluster	Psychological/Cognitive/Sleep Symptom Cluster	Hormonal Symptom Cluster
Anger	0.776	-0.028	0.021	0.150
Impatience	0.738	0.046	0.023	0.291
Irritability	0.797	0.020	0.011	0.314
Mood swings	0.565	0.106	0.086	0.248
Tension	0.566	0.036	0.453	-0.121
Backache or neckache	0.332	0.578	-0.040	-0.059
General body aches	0.059	0.973	-0.111	-0.007
Joint pain or stiffness	-0.064	0.745	0.070	0.023
Numbness or tingling	-0.285	0.675	0.221	0.164
Painful/tender breasts	0.174	0.520	0.090	-0.267
Weight gain	0.061	0.409	-0.129	0.302
Anxiety	0.390	-0.050	0.644	-0.128
Depression	0.392	-0.001	0.463	0.012
Difficulty concentrating	0.385	-0.072	0.586	0.123
Difficulty falling asleep	0.022	0.077	0.737	0.023
Fatigue or tiredness	0.101	0.373	0.535	0.027
Wake during the night	-0.088	0.357	0.708	0.076
Waking too early	0.043	0.324	0.567	-0.070
Daytime sweats	0.145	-0.022	-0.020	0.825
Hot flashes	-0.043	0.008	0.094	0.939
Night sweats	0.091	0.043	0.024	0.839
Vaginal dryness	-0.044	0.260	0.017	0.431
Forgetfulness	0.241	0.145	0.388	0.197
Headache	0.375	0.389	-0.011	0.009
Total number of symptoms in the cluster	5	6	8	4

^aExtraction method: unweighted least squares.

Rotation method: Geomin (oblique) rotation.