Table 2 Rasch analyses of the 35 YFAS2 symptoms

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