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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 modela 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 Withdrawn into myself Behaviour 0.893 0.847 0.028 0.09226 0.21  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’
  1. 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
  2. Misfit after adjusted for multiple testing by the Benjamini–Hochberg procedure: * < 5% false discovery rate (FDR), ** < 1% FDR