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Table 3 Summary of result from the psychometric analyses of part 1 of the COS-AAA

From: Consequences of screening in abdominal aortic aneurysm: development and dimensionality of a questionnaire

The items of part I of the COS-AAA in order of the scales (the item number indicates the order of appearance in the questionnaire) Subscales and misfit Observed Expected Gamma sd Probability of fit to the Rasch model Single or ‘poor’ item
2. worried about my future Anxiety 0.754 0.757 0.039 0.94248  
3. scared Anxiety 0.879 0.776 0.055 0.06203  
11. upset Anxiety 0.823 0.768 0.046 0.23547  
12. restless Anxiety 0.652 0.753 0.041 0.01299a  
13. nervous Anxiety 0.834 0.762 0.045 0.10958  
22. terrified Anxiety 0.819 0.786 0.078 0.67539  
46. shocked Anxiety 0.635 0.777 0.063 0.02409a  
4. irritable Behavioural 0.702 0.728 0.040 0.51894  
5. quieter than normal Behavioural 0.681 0.728 0.041 0.25644  
7. hard to concentrate Behavioural 0.805 0.727 0.040 0.05137  
9. change in appetite Behavioural 0.535 0.746 0.053 0.00006b  
16. withdrawn into myself Behavioural 0.812 0.728 0.050 0.09095  
20. difficulty dealing work or other commitments Behavioural 0.818 0.760 0.059 0.32877  
21. difficulty doing things around the house Behavioural 0.775 0.736 0.047 0.40838  
1. worried Dejection 0.870 0.860 0.025 0.69871  
8. time passed slowly Dejection 0.582 0.676 0.059 0.11251  
10. sad Dejection 0.893 0.820 0.035 0.03861  
14. uneasy Dejection 0.878 0.891 0.021 0.55835  
17. unable to cope Dejection 0.769 0.819 0.034 0.13788  
18. depressed Dejection 0.901 0.819 0.039 0.03908a  
6. slept badly Sleep 0.907 0.872 0.022 0.11844  
15. taken long time to fall asleep Sleep 0.839 0.858 0.027 0.46644  
24. awake most of the night Sleep 0.870 0.884 0.023 0.52241  
32. surprised something was wrong (3-item scale) Uncertainty about the results of the ultra sound examination 0.182 0.368 0.101 0.06646  
39. uncertain about the actual meaning of the examination result (3-item scale) Uncertainty about the results of the ultra sound examination 0.474 0.352 0.107 0.25358  
39. uncertain about the actual meaning of the examination result (2-item scale) Uncertainty about the results of the ultra sound examination 0.942 0.942 0.023 0.99604  
40. difficulties in accepting that the examination result was correct (3-item scale) Uncertainty about the results of the ultra sound examination 0.497 0.331 0.143 0.24422  
40. difficulties in accepting that the examination result was correct (2-item scale) Uncertainty about the results of the ultra sound examination 0.942 0.942 0.023 0.99604  
31. different sense in the body Change in body perception 0.739 0.765 0.038 0.48972  
38. thought my body was vulnerable Change in body perception 0.830 0.766 0.040 0.11518  
42. felt older than my age Change in body perception 0.828 0.773 0.044 0.21437  
49. felt that my body was not my own body Change in body perception 0.858 0.781 0.071 0.27448  
47. feels like something is wrong with my body Change in body perception 0.857 0.773 0.040 0.03655a  
57. felt that I am getting older Change in body perception 0.677 0.771 0.040 0.01867a  
58. noted if I could feel something was different in my stomach Change in body perception 0.694 0.764 0.039 0.07827  
61. experienced that my body was a machine that does not work Change in body perception 0.821 0.770 0.042 0.21602  
33. my own fault Guilt 0.772 0.772 0.092 0.99999  
55. wondered if I should have taken better care of myself Guilt 0.772 0.772 0.092 0.99999  
26. fragile Fear and powerlessness 0.731 0.784 0.038 0.15788  
30. felt vulnerable Fear and powerlessness 0.796 0.796 0.045 0.99903  
37. felt unsafe Fear and powerlessness 0.843 0.808 0.045 0.43550  
43. felt I was unlucky Fear and powerlessness 0.735 0.793 0.039 0.13855  
50. the situation seemed hopeless Fear and powerlessness 0.876 0.811 0.046 0.15857  
54. felt powerless Fear and powerlessness 0.856 0.801 0.044 0.20922  
60. experienced that I lost control Fear and powerlessness 0.892 0.834 0.050 0.24566  
29. unpleasant examination(s) Negative experiences from the examination 0.891 0.891 0.064 0.99928  
48. felt vulnerable at the examination bed Negative experiences from the examination 0.891 0.891 0.064 0.99928  
25. angry Emotional reactions 0.912 0.914 0.021 0.94175  
28. felt sour (attitude) Emotional reactions 0.911 0.885 0.028 0.36390  
56. experienced mood swings Emotional reactions 0.885 0.902 0.022 0.45158  
36. changed exercise habits Change in lifestyle 0.767 0.765 0.046 0.96988  
44. changed diet habits Change in lifestyle 0.767 0.765 0.046 0.96988  
27. regret screening examination Better not knowing 0.958 0.960 0.031 0.95912  
45. better not to know about the aneurism Better not knowing 0.958 0.960 0.031 0.95912  
34. fear of rupture at the back of one’s mind Fear of rupture 0.830 0.818 0.048 0.80348  
35. worried about rupture at hard physical activities Fear of rupture 0.893 0.801 0.050 0.06566  
52. worried if I had to push myself Fear of rupture 0.863 0.777 0.094 0.36041  
53. do not dare to push myself as usual Fear of rupture 0.645 0.781 0.060 0.02442§  
62. less interest in sex Sexuality 0.897 0.878 0.035 0.57648  
63. negative impact on my sex life Sexuality 0.899 0.876 0.035 0.50434  
64. worried about rupture of the aneurism during sexual activities Sexuality 0.803 0.862 0.047 0.20584  
66. searched the Internet for knowledge about aneurism Information 0.991 0.991 0.006 0.99997  
67. I have looked for knowledge about how the aorta can change Information 0.991 0.991 0.006 0.99997  
19. busy to take mind off things Single item Not included Not included Not included Not included Single item
23. woken up far too early in the morning Misfit (Sleep) 0.600 0.770 0.031 < 0.00001b ‘Poor’ or single item
41. thought about death Single item Not included Not included Not included Not included ‘Poor’ or single item
51. felt sick Single item Not included Not included Not included Not included ‘Poor’ or single item
59. more tired than usual Single item Not included Not included Not included Not included ‘Poor’ or single item
65. missed information about physical activities and aneurism Misfit (Information) 0.357 0.593 0.077 0.00199b ‘Poor’ or single item
  1. aAdjusting the p-values in the table in order to control the false discovery rate and so avoid spurious significant results due to multiple testing suggested that this result should be regarded as not significant [38]
  2. bMisfit after a correction by the Benjamini-Hochberg procedure [38]