Table 4.
Results from the psychometric analyses of part I of the COS-CRC
| 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 Withdrawn into myself | Behaviour | 0.893 | 0.847 | 0.028 | 0.09226 | 0.21 | |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’ |
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