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Table 5 Results from the psychometric analyses of part Ix of the COS-CRC

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

COS-CRC Part Ix: 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
47. Discomfort with having bowel emptied Perceived burden of bowel preparation 0.763 0.736 0.040 0.49617 − 1.08  
48. Feeling of having a lesion on rectum Perceived burden of bowel preparation 0.830 0.775 0.047 0.24357 0.79  
49. Stinging feeling in the rectum Perceived burden of bowel preparation 0.822 0.759 0.047 0.18284 0.85  
50. Pain during emptying of bowel Perceived burden of bowel preparation 0.754 0.792 0.047 0.42003 0.86  
51. Feeling of a rash on backside Perceived burden of bowel preparation 0.805 0.759 0.047 0.33519 0.82  
52. Feeling stranded at home during emptying of bowel Perceived burden of bowel preparation 0.661 0.737 0.041 0.06132 − 1.98  
53. Worried about drinking other fluids during emptying of bowel Perceived burden of bowel preparation 0.605 0.736 0.046 0.00444 0.34 ‘Poor item’
54. Anxious about having one or more polyps Knowledge of having colorectal polyps 0.936 0.936 0.029 0.98862 − 2.88  
55. Confused about what it means to have one or more polyps Knowledge of having colorectal polyps 0.936 0.936 0.029 0.98862 3.00  
56. Discomfort during the colonoscopy Negative experiences of the colonoscopy 0.742 0.739 0.034 0.91764 − 1.17  
56. Discomfort during the colonoscopy Negative physical experiences of the colonoscopy 0.900 0.870 0.027 0.26895 − 0.77  
57. Felt defenseless lying on the examination table Negative experiences of the colonoscopy 0.840 0.735 0.038 0.00567 − 0.23  
57. Felt defenseless lying on the examination table Negative emotional experiences of the colonoscopy 0.850 0.868 0.025 0.49037 − 0.53  
58. Felt vulnerable lying on the examination table Negative experiences of the colonoscopy 0.854 0.735 0.038 0.00188* − 0.19  
58. Felt vulnerable lying on the examination table Negative emotional experiences of the colonoscopy 0.894 0.871 0.025 0.36890 − 0.46  
59. Pain during the colonoscopy Negative experiences of the colonoscopy 0.598 0.742 0.035 0.00004** − 0.67  
59. Pain during the colonoscopy Negative physical experiences of the colonoscopy 0.855 0.860 0.026 0.85238 0.06  
60. Humiliation lying on the examination table Negative experiences of the colonoscopy 0.698 0.727 0.043 0.50161 0.45  
60. Humiliation lying on the examination table Negative emotional experiences of the colonoscopy 0.844 0.856 0.030 0.69602 0.59  
61. The examination was a harsh experience Negative experiences of the colonoscopy 0.786 0.742 0.040 0.27558 0.01  
61. The examination was a harsh experience Negative physical experiences of the colonoscopy 0.852 0.871 0.027 0.47659 1.28  
62. Lying on the examination table overstepped my boundaries Negative experiences of the colonoscopy 0.684 0.725 0.046 0.37364 0.60  
62. Lying on the examination table overstepped my boundaries Negative emotional experiences of the colonoscopy 0.856 0.854 0.031 0.96742 0.95  
63. Felt exposed lying on the examination table Negative experiences of the colonoscopy 0.737 0.726 0.046 0.81139 0.58  
63. Felt exposed lying on the examination table Negative emotional experiences of the colonoscopy 0.878 0.852 0.031 0.40937 0.87  
64. Regrets having participated in the screening programme Regret participation N/A N/A N/A N/A N/A ‘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. * < 5% false discovery rate (FDR), ** < 1% FDR