Consequences of screening in colorectal cancer (COS-CRC): development and dimensionality of a questionnaire

Malmqvist, Jessica; Siersma, Volkert; Bang, Christine Winther; Brodersen, John

doi:10.1186/s40359-020-00504-3

BMC Psychology

Table 4 Results from the psychometric analyses of part I of the COS-CRC

From: Consequences of screening in colorectal cancer (COS-CRC): development and dimensionality of a questionnaire

COS-CRC Part I: item order in the questionnaire	Subscales and misfit	Observed	Expected	Gamma sd	Probability of fit to the Rasch model^a	Item difficulty	Single or ‘poor’ item
1. Worried	Dejection	0.848	0.894	0.018	0.00888	− 0.73
2. Worried about my future	Anxiety	0.873	0.887	0.019	0.45578	− 0.92
3. Scared	Anxiety	0.898	0.886	0.021	0.59302	− 0.40
4. Irritable	Behaviour	0.858	0.850	0.026	0.73171	− 0.10
5. Quieter than normal	Behaviour	0.838	0.854	0.024	0.51721	− 0.26
6. Slept badly	Sleep	0.895	0.833	0.025	0.01292	− 0.16
7. Hard to concentrate	Behaviour	0.907	0.850	0.026	0.02683	− 0.20
8. Time passed slowly	Dejection	0.845	0.892	0.021	0.02684	0.26
9. Change in appetite	Behaviour	0.760	0.851	0.030	0.00210*	0.32
10. Sad	Dejection	0.934	0.890	0.020	0.02943	0.15
11. Upset	Anxiety	0.914	0.890	0.023	0.28643	0.29
12. Restless	Anxiety	0.831	0.884	0.022	0.01562	0.20
13. Nervous	Anxiety	0.918	0.886	0.020	0.11772	− 0.53
14. Uneasy	Dejection	0.936	0.891	0.019	0.01951	− 0.00
15. Taken long time to fall asleep	Sleep	0.817	0.830	0.026	0.62877	0.05
16. Withdrawn into myself	Behaviour	0.893	0.847	0.028	0.09226	0.21
17. Unable to cope	Dejection	0.902	0.896	0.024	0.80840	0.98
18. Depressed	Dejection	0.909	0.893	0.021	0.44646	0.35
19. Difficulty dealing with work or other commitments	Behaviour	0.827	0.854	0.028	0.33385	0.14
20. Woken up far too early in the morning	Sleep	0.751	0.831	0.025	0.00137*	− 0.28
21. Difficulty doing things around the house	Behaviour	0.853	0.850	0.028	0.93310	0.17
22. Terrified	Anxiety	0.915	0.914	0.029	0.96312	1.32
23. Awake most of the night	Sleep	0.889	0.832	0.029	0.04738	0.73
24. Felt sorry for myself	Introvert	0.874	0.868	0.028	0.83291	0.68
25. Shocked	Anxiety	0.915	0.896	0.025	0.45338	0.78
26. Fear of CRC has, more than usual, been in the back of my mind	Introvert, misfit	0.775	0.836	0.024	0.01016	− 0.72	‘Poor item’
27. Insecure	Introvert	0.875	0.867	0.024	0.71943	0.04
28. Felt as though something is wrong with my body	Change in body perception	0.918	0.920	0.018	0.89586	− 0.58
29. Felt as though my body was a machine that does not work	Change in body perception	0.934	0.919	0.020	0.47468	0.84
30. Thought my situation was hopeless	Introvert	0.951	0.882	0.028	0.01395	0.55
31. Experienced that I lost control	Fear & Powerlessness	0.939	0.920	0.025	0.44568	0.92
32. Experienced mood swings	Introvert	0.885	0.868	0.023	0.46397	0.04
33. Thought my body was vulnerable	Change in body perception	0.917	0.923	0.018	0.73558	0.23
34. Kept my thoughts to myself	Introvert	0.824	0.877	0.021	0.01050	− 0.81
35. Felt that I am getting old	Change in perception of own age	0.894	0.894	0.029	0.99083	− 0.38
36. Felt sour (attitude)	Emotional reactions minus item 41	0.964	0.964	0.013	0.99810	4.08
36. Felt sour (attitude)	Emotional reactions with split item 41 for diagnosis	0.912	0.880	0.028	0.26157	1.57
37. Angry	Emotional reactions minus item 41	0.964	0.964	0.013	0.99810	2.23
37. Angry	Emotional reactions with split item 41 for diagnosis	0.907	0.880	0.028	0.35081	0.21
38. Felt I have been in a vacuum	Fear & powerlessness	0.916	0.890	0.024	0.29461	− 0.22
39. Felt older than my age	Change in perception of own age	0.894	0.894	0.029	0.99083	0.58
40. Felt powerless	Fear & powerlessness	0.885	0.889	0.025	0.85095	0.02
41. Frightened	Emotional reactions, misfit	0.792	0.876	0.028	0.00262*	− 0.43	‘Poor item’
41. Frightened	Emotional reactions	0.792	0.861	0.030	0.02251	Negative results: 1.57 Control persons: 1.04 Non-attendees: 0.22 Clean colon: − 1.24 Benign polyps: − 0.68 Adenomatous polyps: − 0.47 CRC: − 1.38
42. Felt I was unlucky	Fear & powerlessness	0.846	0.880	0.025	0.17683	− 0.39
43. Have changed diet	Lifestyle changes	0.864	0.863	0.031	0.98433	0.08	‘Single item’
44. Have changed exercise habits	Lifestyle changes	0.864	0.863	0.031	0.98433	0.06	‘Poor item’
45. Less interest in sex	Sexuality	0.959	0.959	0.013	0.98287	0.04	‘Poor item’
46. Negative impact on sex life	Sexuality	0.959	0.959	0.013	0.98287	0.41	‘Single item’

^aBenjamini-Hochberg rejects all p-values < 0.0033 to control the FDR at 0.05 and < 0.0002 to control the FDR at 0.01
Misfit after adjusted for multiple testing by the Benjamini–Hochberg procedure: * < 5% false discovery rate (FDR), ** < 1% FDR

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ISSN: 2050-7283

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