Table 1 |
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Four-Dimensional Symptom Questionnaire (4DSQ): items, scale, and factor loadings (confirmatory factor analysis, test-set) |
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During the past week, did you suffer from: |
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1. dizziness or feeling light-headed? |
Som |
0.51 |
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2. painful muscles? |
Som |
0.44 |
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3. fainting? |
Som |
0.21 |
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4. neck pain? |
Som |
0.40 |
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5. back pain? |
Som |
0.37 |
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6. excessive perspiration? |
Som |
0.42 |
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7. palpitations? |
Som |
0.61 |
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8. headache? |
Som |
0.30 |
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9. a bloated feeling in the abdomen? |
Som |
0.53 |
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10. blurred vision or spots in front of your eyes? |
Som |
0.51 |
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11. shortness of breath? |
Som |
0.63 |
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12. nausea or an upset stomach? |
Som |
0.47 |
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13. pain in the abdomen or stomach area? |
Som |
0.46 |
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14. tingling in the fingers? |
Som |
0.50 |
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15. pressure or a tight feeling in the chest? |
Som |
0.70 |
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16. pain in the chest? |
Som |
0.65 |
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17. feeling down or depressed? |
Dis |
0.66 |
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18. sudden shock for no reason? |
Anx |
0.52 |
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19. worry? |
Dis |
0.45 |
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20. disturbed sleep? |
Dis |
0.39 |
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21. indefinable feelings of fear? |
Anx |
0.74 |
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22. listlessness? |
Dis |
0.66 |
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23. trembling when with other people? |
Anx |
0.57 |
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24. anxiety or panic attacks? |
Anx |
0.79 |
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During the past week, did you feel: |
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25. tense? |
Dis |
0.50 |
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26. easily irritated? |
Dis |
0.53 |
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27. frightened? |
Anx |
0.79 |
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28. that everything is meaningless? |
Dep |
0.75 |
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29. that you just can't do anything anymore? |
Dis |
0.76 |
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30. that life is not worth while? |
Dep |
0.86 |
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31. that you can no longer take any interest in the people and things around you? |
Dis |
0.71 |
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32. that you can't cope anymore? |
Dis |
0.80 |
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33. that you would be better off if you were dead? |
Dep |
0.79 |
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34. that you can't enjoy anything anymore? |
Dep |
0.70 |
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35. that there is no escape from your situation? |
Dep |
0.73 |
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36. that you can't face it anymore? |
Dis |
0.79 |
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During the past week, did you: |
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37. no longer feel like doing anything? |
Dis |
0.79 |
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38. have difficulty in thinking clearly? |
Dis |
0.63 |
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39. have difficulty in getting to sleep? |
Dis |
0.41 |
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40. have any fear of going out of the house alone? |
Anx |
0.65 |
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During the past week: |
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41. did you easily become emotional? |
Dis |
0.50 |
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42. were you afraid of anything when there was really no need for you to be afraid? (for instance animals, heights, small rooms) |
Anx |
0.64 |
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43. were you afraid to travel on busses, trains or trams? |
Anx |
0.59 |
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44. were you afraid of becoming embarrassed when with other people? |
Anx |
0.53 |
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45. did you ever feel as if you were being threatened by unknown danger? |
Anx |
0.54 |
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46. did you ever think "If only I was dead"? |
Dep |
0.77 |
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47. did you ever have fleeting images of any upsetting event(s) that you have experienced? |
Dis |
0.40 |
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48. did you ever have to do your best to put aside thoughts about any upsetting event(s)? |
Dis |
0.45 |
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49. did you have to avoid certain places because they frightened you? |
Anx |
0.63 |
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50. did you have to repeat some actions a number of times before you could do something else? |
Anx |
0.42 |
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Dis = Distress, Dep = Depression, Anx = Anxiety, Som = Somatization |
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Terluin et al. BMC Psychiatry 2006 6:34 doi:10.1186/1471-244X-6-34 |
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