Table 3 Intraclass correlation coefficients (ICC) for the original instrument MMQL – Youth Form (n = 110)

1. I do as well as my friends in sports

108

0.527

0.38 - 0.65

2. I have a lot of energy

107

0.654

0.53 - 0.75

3. I have a lot of energy for running or sports

105

0.759

0.67 - 0.83

4. I cannot do many activities because of my health

107

0.552

0.41 - 0.67

5. I cannot do many activities because of problems with my arms or legs

107

0.490

0.33 - 0.62

6. In games and sports, I like to watch rather than take part

107

0.567

0.42 - 0.68

7. Sad?

108

0.527

0.38 - 0.65

8. Angry?

108

0.637

0.51 - 0.74

9. Lonely?

108

0.464

0.30 - 0.60

10. Frightened?

107

0.648

0.52 - 0.75

11. Worried about dying?

107

0.710

0.60 - 0.79

12. Worried about your health?

108

0.471

0.31 - 0.61

13. Worried about things in general?

104

0.524

0.37 - 0.65

14. Not as good as most people?

107

0.432

0.27 - 0.57

15. My parents treat me in the same way they treat my brothers and sisters

105

0.571

0.43 - 0.69

16. My parents are usually patient with me

103

0.759

0.66 - 0.83

17. feel different from your friends

106

0.508

0.35 - 0.64

18. Do you have pain or discomfort in your stomach or tummy?

106

0.515

0.36 - 0.64

19.Do you have headahes?

107

0.637

0.51 - 0.74

20. Do your arms and legs ache?

108

0.634

0.51 - 0.73

21. Do you have discomfort in yor chest during active exercise?

106

0.600

0.46 - 0.71

22. Do you get pains that wake you up at night?

107

0.660

0.54 - 0.76

23. Do you have difficulty with your hearing?

108

0.713

0.61 - 0.78

24. Do you have difficulty with your talking (e.g., stuttering/stammer)?

107

0.731

0.63 - 0.81

25. Do you have difficulty seeing clearly (even wearing glasses)?

107

0.481

0.32 - 0.61

26. Do you have difficulty falling asleep?

108

0.686

0.57 - 0.78

27. I am looking forward to the future

108

0.630

0.50 - 0.73

28. I am happy the way things are

109

0.557

0.41 - 0.67

29. I am happy with the state of my health

108

0.648

0.52 - 0.75

30. I am happy with my life in general

109

0.781

0.70 - 0.85

31. I am a healthy person

109

0.775

0.69 - 0.84

32. I expect to live a long life. I expect to grow old

108

0.584

0.44 - 0.70