Table 2.
Rasch analyses of the 35 YFAS2 symptoms
| Item | Measure | SE | Infit | Outfit | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MnSq | Zstd | MnSq | Zstd | ||||||||||
| 1. When I started to eat certain foods, I ate much more than planned+ | − 0.86 | 0.03 | 2.56 | 9.0 | 3.25 | 9.0 | |||||||
| 2. I continued to eat certain foods even though I was no longer hungry+ | − 0.95 | 0.03 | 2.58 | 9.0 | 3.33 | 9.0 | |||||||
| 3. I ate to the point where I felt physically ill | − 0.08 | 0.03 | 1.14 | 2.5 | 1.60 | 7.2 | |||||||
| 4. I worried a lot about cutting down on certain types of food, but I ate them anyways | − 0.15 | 0.03 | 1.27 | 4.7 | 1.42 | 5.4 | |||||||
| 5. I spent a lot of time feeling sluggish or tired from overeating. | 0.03 | 0.03 | 0.86 | − 2.8 | 0.81 | − 2.7 | |||||||
| 6. I spent a lot of time eating certain foods throughout the day | − 0.05 | 0.03 | 0.88 | − 2.3 | 0.94 | − 0.7 | |||||||
| 7. When certain foods were not available, I went out of my way to get them. For example, I went to the store to get certain foods even though I had other things to eat at home+ | − 0.43 | 0.03 | 1.54 | 9.0 | 2.24 | 9.0 | |||||||
| 8. I ate certain foods so often or in such large amounts that I stopped doing other important things. These things may have been working or spending time with family or friends | 0.11 | 0.03 | 0.81 | − 3.8 | 0.70 | − 4.4 | |||||||
| 9. I had problems with my family or friends because of how much I overate. | 0.21 | 0.04 | 0.81 | − 3.7 | 0.65 | − 5.1 | |||||||
| 10. I avoided work, school or social activities because I was afraid I would overeat there | 0.25 | 0.04 | 0.80 | − 3.8 | 0.64 | − 5.1 | |||||||
| 11. When I cut down on or stopped eating certain foods, I felt irritable, nervous or sad | − 0.04 | 0.03 | 0.75 | − 5.1 | 0.67 | − 5.1 | |||||||
| 12. If I had physical symptoms because I hadn’t eaten certain foods, I would eat those foods to feel better | − 0.13 | 0.03 | 0.84 | − 3.1 | 0.90 | − 1.4 | |||||||
| 13. If I had emotional problems because I hadn’t eaten certain foods, I would eat those foods to feel better | − 0.23 | 0.03 | 1.00 | 0 | 1.06 | 0.9 | |||||||
| 14. When I cut down on or stopped eating certain foods, I had physical symptoms. For example, I had headaches or fatigue | 0.18 | 0.03 | 0.88 | − 2.2 | 0.95 | − 0.6 | |||||||
| 15. When I cut down or stopped eating certain foods, I had strong cravings for them | − 0.52 | 0.03 | 1.47 | 8.2 | 2.06 | 9.0 | |||||||
| 16. My eating behavior caused me a lot of distress | 0.08 | 0.03 | 0.86 | − 2.7 | 0.84 | − 2.2 | |||||||
| 17. I had significant problems in my life because of food and eating. These may have been problems with my daily routine, work, school, friends, family, or health | 0.11 | 0.03 | 0.76 | − 4.9 | 0.75 | − 3.5 | |||||||
| 18. I felt so bad about overeating that I didn’t do other important things. These things may have been working or spending time with family or friends | 0.30 | 0.04 | 0.69 | − 6.0 | 0.54 | − 6.9 | |||||||
| 19. My overeating got in the way of me taking care of my family or doing household chores | 0.37 | 0.04 | 0.78 | − 4.1 | 0.58 | − 6.0 | |||||||
| 20. I avoided work, school or social functions because I could not eat certain foods there | 0.32 | 0.04 | 0.80 | − 3.7 | 0.66 | − 4.7 | |||||||
| 21. I avoided social situations because people wouldn’t approve of how much I ate | 0.42 | 0.04 | 0.85 | − 2.6 | 0.65 | − 4.6 | |||||||
| 22. I kept eating in the same way even though my eating caused emotional problems | 0.14 | 0.03 | 1.00 | 0.0 | 1.01 | 0.1 | |||||||
| 23. I kept eating the same way even though my eating caused physical problems | 0.13 | 0.03 | 0.89 | − 2.0 | 0.85 | − 2.0 | |||||||
| 24. Eating the same amount of food did not give me as much enjoyment as it used to | 0.16 | 0.03 | 0.87 | − 2.5 | 0.75 | − 3.5 | |||||||
| 25. I really wanted to cut down on or stop eating certain kinds of foods, but I just couldn’t | − 0.16 | 0.03 | 1.07 | 1.2 | 1.08 | 1.1 | |||||||
| 26.I needed to eat more and more to get the feelings I wanted from eating. This included reducing negative emotions like sadness or increasing pleasure | − 0.13 | 0.03 | 0.85 | − 2.9 | 0.95 | − 0.7 | |||||||
| 27. I didn’t do well at work or school because I was eating too much | 0.30 | 0.04 | 0.80 | − 3.8 | 0.59 | − 6.0 | |||||||
| 28. I kept eating certain foods even though I knew it was physically dangerous. For example, I kept eating sweets even though I had diabetes. Or I kept eating fatty foods despite having heart disease | − 0.11 | 0.03 | 1.14 | 2.5 | 1.19 | 2.5 | |||||||
| 29. I had such strong urges to eat certain foods that I couldn’t think of anything else | 0.15 | 0.03 | 0.68 | − 6.6 | 0.62 | − 5.7 | |||||||
| 30. I had such intense cravings for certain foods that I felt like I had to eat them right away | − 0.09 | 0.03 | 0.89 | − 2.0 | 0.93 | − 0.9 | |||||||
| 31. I tried to cut down on or not eat certain kinds of food, but I wasn’t successful | − 0.15 | 0.03 | 1.08 | 1.5 | 1.11 | 1.5 | |||||||
| 32. I tried and failed to cut down on or stop eating certain foods | − 0.17 | 0.03 | 1.11 | 2.0 | 1.03 | 0.4 | |||||||
| 33. I was so distracted by eating that I could have been hurt (e.g., when driving a car, crossing the street, operating machinery). | 0.38 | 0.04 | 0.86 | − 2.6 | 0.60 | − 5.5 | |||||||
| 34. I was so distracted by thinking about food that I could have been hurt (e.g., when driving a car, crossing the street, operating machinery) | 0.40 | 0.04 | 0.86 | − 2.4 | 0.61 | − 5.4 | |||||||
| 35.My friends or family were worried about how much I overate | 0.20 | 0.04 | 1.15 | 2.5 | 1.09 | 1.0 |
MnSq mean square; Zstd standardized score
+Infit statistics > 1.5 associated with Zstd > 2: item misfit