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Table 1 Potentially problematic items according to criteria in Patrick, et al. [6]

From: Evaluation of the Irritable Bowel Syndrome Quality of Life (IBS-QOL) questionnaire in diarrheal-predominant irritable bowel syndrome patients

Item Reason(s) why item is problematic
6. I feel like I’m losing control of my life because of my bowel problems. • High item-to-item correlation: r6,7 = 0.732
• High item-to-item correlation: r6,10 = 0.702
7. I feel my life is less enjoyable because of my bowel problems. • High item-to-item correlation: r7,6 = 0.732
9. I feel depressed about my bowel problems. • High item-to-item correlation: r9,10 = 0.707
10. I feel isolated form others because of my bowel problems. • High item-to-item correlation: r10,6 = 0.732
• High item-to-item correlation: r10,9 = 0.707
12. Because of my bowel problems, sexual activity is difficult for me. • High item-to-item correlation: r12,20 = 0.741
20. My bowel problems reduce my sexual desire. • High item-to-item correlation: r20,12 = 0.741
29. It is important to be near a toilet because of my bowel problems. • High item-to-item correlation: r29,30 = 0.708
• Potential ceiling effect: 38.9% of patients reporting, “a great deal”
30. My life revolves around my bowel problems. • High item-to-item correlation: r30,29 = 0.708
32. I fear I won’t be able to have a bowel movement. • Floor effect: 72.8% of patients reporting “not at all”
• Low item-total correlation: r32,Total = 0.292
33. My bowel problems are affecting my closest relationships • Potential floor effect: 46.4% of patients reporting “not at all”