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

Brodersen, John; Hansson, Anders; Johansson, Minna; Siersma, Volkert; Langenskiöld, Marcus; Pettersson, Monica

doi:10.1186/s41687-018-0066-1

Journal of Patient-Reported Outcomes

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	0.01299^a
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	0.02409^a
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	0.00006^b
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 withdrawn into myself	Behavioural	0.812	0.728	0.050	0.09095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	0.03908^a
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	0.03655^a
57. felt that I am getting older	Change in body perception	0.677	0.771	0.040	0.01867^a
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	< 0.00001^b	‘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	0.00199^b	‘Poor’ or single item

^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]
^bMisfit after a correction by the Benjamini-Hochberg procedure [38]

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