Table 4.

Construct validity of the MDASI-OC: factor analysis and underlying constructs

	Factors
	1	2	3	4	5	6
Pain
Back pain	0.697	−0.003	0.052	−0.115	0.062	0.039
Pain in the abdomen	0.528	0.066	−0.186	0.388	0.129	0.363
Pain	0.470	0.183	−0.035	0.297	0.192	0.156
Disturbed sleep	0.349	−0.027	0.037	0.166	0.137	0.045
Cognitive
Problem with paying attention	0.018	−0.736	−0.001	0.050	0.214	0.134
Difficulty remembering	−0.115	−0.617	0.241	0.027	0.196	0.021
Feeling drowsy	0.355	−0.447	0.129	0.135	0.068	−0.051
Disease-related and numbness
Numbness/tingling	−0.022	−0.057	0.621	−0.067	−0.019	−0.015
Shortness of breath	0.063	0.015	0.515	0.136	0.106	0.050
Leg cramps or leg muscle pain	0.114	−0.099	0.433	0.131	0.052	−0.001
Urinary urgency	0.331	−0.145	0.338	−0.009	−0.095	−0.001
Treatment-related
Vomiting	0.021	−0.058	−0.034	0.872	−0.067	−0.171
Nausea	−0.017	0.191	0.192	0.677	0.061	0.120
Pain or burning with urination	−0.054	−0.086	−0.018	0.443	0.037	0.118
Dry mouth	0.154	−0.231	0.138	0.278	−0.175	0.153
Affective
Being distressed	0.080	−0.046	0.122	−0.056	0.888	−0.039
Feeling sad	0.003	−0.310	−0.210	−0.003	0.621	0.177
Fatigue	0.277	−0.169	0.243	0.074	0.398	−0.140
Gastrointestinal
Constipation	0.102	−0.166	−0.098	−0.032	0.017	0.712
Lack of appetite	−0.083	0.223	0.360	0.169	0.120	0.483
Feeling bloated	0.423	−0.061	0.208	−0.048	−0.032	0.441

Abbreviation: MDASI-OC, ovarian cancer module of the M. D. Anderson Symptom Inventory.