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Table 2 Correlations among the questionnaire parameters

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

(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
  1. Spearman’s correlation coefficient was performed for all patients (n = 107). The values represent the Spearman’s rho correlation coefficient
  2. 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
  3. ** p < 0.01, * p < 0.05, Bold: stronger correlation