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Table 5 Results of the item-total analysis and factor analysis 

From: Validity and reliability of the Japanese versions of cognitive and behavioral scales for irritable bowel syndrome

  26-item version 18-item version
  Factor loadings   Factor loadings
Items Item-total correlation Factor 1 Factor 2 Item-total correlation Factor 1 Factor 2
13. I avoid making plans in case I have problems with my IBS 0.706 0.936 -0.075 0.699 0.950 -0.083
12. I avoid going out in case I have problems with my IBS 0.726 0.894 -0.020 0.721 0.909 -0.033
26. I avoid staying away from home overnight in case my IBS flares up 0.579 0.859 -0.159 0.595 0.847 -0.130
21. I avoid certain social situations (e.g., restaurants) because of my IBS 0.655 0.794 -0.016 0.668 0.758 0.035
20. I avoid certain work situations (e.g., meetings) because of my IBS 0.736 0.794 0.086 0.752 0.758 0.146
14. I carry other items (e.g., wet wipes, sanitary towels, spare underwear) in case my IBS flares up 0.617 0.683 -0.110 0.608 0.682 -0.121
17. I avoid sex in case my IBS flares up (and causes embarrassment) 0.559 0.682 -0.161 0.551 0.716 -0.207
15. I take medication (e.g., before going out) just in case my IBS flares up 0.683 0.665 0.017 0.704 0.599 0.100
22. I avoid certain foods (e.g., dairy products, spicy foods) because of my IBS 0.665 0.626 0.114 0.667 0.586 0.155
19. I ask for reassurance about my IBS 0.690 0.610 0.267 0.706 0.559 0.341
16. I carry medication with me in case my IBS flares up 0.693 0.516 0.125 0.725 0.439 0.221
24. When I have diarrhea I do things to ease it (e.g. take prescribed medication, take alternative medication) 0.623 0.436 0.122   - -
10. I avoid certain foods when I have bowel problems 0.600 0.301 0.211   - -
9. I avoid exercise when I have stomach pains 0.511 0.290 0.151   - -
11. I wear baggy clothing when my stomach feels bloated or distended 0.463 0.252 0.112   - -
6. I spend more time on the toilet than I ideally would like 0.632 -0.087 0.733 0.655 -0.068 0.694
4. After opening my bowels I check for blood 0.453 -0.170 0.703 0.487 -0.167 0.686
5. After opening my bowels I check my stool for abnormalities 0.526 -0.170 0.701 0.574 -0.188 0.712
3. I strain when opening my bowels 0.635 0.107 0.650 0.640 0.127 0.603
25. I am constantly aware of my stomach 0.752 0.117 0.639 0.759 0.032 0.733
7. I often go to the toilet to open my bowels and then do not pass anything 0.564 0.019 0.545 0.581 0.053 0.482
18. When I go out, I make sure I know where the nearest toilet is 0.741 0.366 0.441 0.746 0.295 0.525
8. I often go to the toilet to pass water and find I open my bowels 0.476 0.125 0.426   - -
1. I eat specific foods to help me open my bowels more 0.481 0.022 0.399   - -
2. I eat specific foods to help me open my bowels less 0.491 0.240 0.393   - -
23. After I open my bowels, I wipe more than I would like 0.609 0.264 0.390   - -
  Eigenvalue 9.63 1.57 Eigenvalue 7.89 1.38
  Variance (%) 37.03% 43.06% Variance (%) 43.84% 51.51%
  Cronbach’s α =0.93 Cronbach’s α = 0.92