Orthostatic intolerance symptoms are associated with depression and diminished quality of life in patients with postural tachycardia syndrome

Table 2 Correlations among the questionnaire parameters

(n = 107)	OIQ Total	BDI-II	PCS	MCS
OIQ Total Score		.571**	−.534**	−.436**
1. Nausea		.401**	−.379**	−.209*
2. Tremor in hands		.325**	−.157	−.176
3. Dizziness		.272**	−.462**	−.307**
4. Palpitation		.426**	−.390**	−.283**
5. Headache		.224*	−.434**	−.262**
6. Profuse perspiration		.272**	−.213*	−.096
7. Blurred vision		.339**	−.249**	−.248*
8. Chest discomfort		.518**	−.348**	−.399**
9. Lightheadedness		.413**	−.511**	−.335**
10. Concentration difficulties		.532**	−.404**	−.466**
Max HR increase	−.081	−.032	.123	.083

Spearman’s correlation coefficient was performed for all patients (n = 107). The values represent the Spearman’s rho correlation coefficient
Abbreviations: OIQ orthostatic intolerance questionnaire, BDI-II Beck depression inventory-II, PCS physical component summary scale of Short Form 36, MCS mental component summary scale of Short Form 36
** p < 0.01, * p < 0.05, Bold: stronger correlation

ISSN: 1477-7525