Adaptation and validation of the Hungarian version of Thyroid-Related Patient-Reported Outcome-39 (ThyPro-39) questionnaire: testing factor structure, known-group validity with the comparison of quality of life in Hashimoto’s thyroiditis and Graves’ disease

Journal of Patient-Reported Outcomes

Table 5 Bifactor model of somatic symptoms

Items (abbreviated)	General factor	Goitre symptoms	Hyperthyroid symptoms	Hypothyroid symptoms	Eye symptoms	Cosmetic Complaints
Fullness in neck	0.470	0.439
Pressure in throat	0.480	0.877
Discomfort swallowing	0.548	0.571
Trembling hands	0.356		0.354
Tendency to sweet	0.467		0.272
Palpitation	0.445		0.750
Upset stomach	0.557		0.108
Cold sensitivity	0.295			0.182
Swollen hands/feet	0.522			0.067
Dry skin	0.443			0.810
Itchy skin	0.491			0.451
Dryness, grittiness in eyes	0.502				0.499
Impaired vision	0.510				0.646
Light sensitivity	0.467				0.547
Changed appearance	0.479					0.693
Others gazing you	0.323					0.644
Change in worn clothes	0.457					0.649
ECV	0.41	0.14	0.09	0.10	0.11	0.15
Omega	0.90	0.86	0.70	0.70	0.80	0.83
Omega hierarchical	0.73	0.53	0.28	0.30	0.45	0.59
Relative omega	0,80	0,61	0,40	0,43	0,57	0,71

Note: Percent of uncontaminated correlations (PUC) = 0.846. ECV = explained common variance