Table 1.
Factorial structures of the RPQ investigated in the present study
| Item label (shortened version) | One-factor model [6] | Two-factor model [19] | Two-factor model [20] | Three-factor model [21] | Three-factor model [22] | Four-factor model [23] |
|---|---|---|---|---|---|---|
| Headaches | RPQ | Emotional-somatic | RPQ-3 | Somatic | General somatic | Vertigo |
| Dizziness | RPQ | Emotional-somatic | RPQ-3 | Somatic | General somatic | Vertigo |
| Nausea | RPQ | Emotional-somatic | RPQ-3 | Somatic | General somatic | Vertigo |
| Noise sensitivity | RPQ | Emotional-somatic | RPQ-13 | Somatic | General somatic | Vertigo |
| Sleep disturbance | RPQ | Emotional-somatic | RPQ-13 | Somatic | General somatic | Mood/somatic |
| Fatigue | RPQ | Emotional-somatic | RPQ-13 | Somatic | Mood/cognition | Mood/somatic |
| Irritable | RPQ | Emotional-somatic | RPQ-13 | Emotional | Mood/cognition | Mood/somatic |
| Depressed | RPQ | Emotional-somatic | RPQ-13 | Emotional | Mood/cognition | Mood/somatic |
| Frustrated | RPQ | Emotional-somatic | RPQ-13 | Emotional | Mood/cognition | Mood/somatic |
| Forgetful | RPQ | Cognitive | RPQ-13 | Cognitive | Mood/cognition | Cognitive |
| Poor concentration | RPQ | Cognitive | RPQ-13 | Cognitive | Mood/cognition | Cognitive |
| Longer to think | RPQ | Cognitive | RPQ-13 | Cognitive | Mood/cognition | Cognitive |
| Blurred vision | RPQ | Emotional-somatic | RPQ-13 | Somatic | Visual somatic | Vision |
| Light sensitivity | RPQ | Emotional-somatic | RPQ-13 | Somatic | Visual somatic | Vision |
| Double vision | RPQ | –a | RPQ-13 | Somatic | Visual somatic | Vision |
| Restless | RPQ | Emotional-somatic | RPQ-13 | Emotional | General somatic | Mood/Somatic |
aItem Double vision was excluded from the model