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Table 1 Weighted quadratic Kappa with confidence intervals (IC) and Cronbach’s Alpha by questions

From: Test-retest reliability of Common Mental Disorders Questionnaire (CMDQ) in patients with total hip replacement (THR)

During the last 4 weeks how much were you bothered by: Kappa (IC) Kappa (IC). highest value (four) instead of missing Kappa (IC). smallest value (zero) instead of missing Kappa (IC). Mean of individual score of the questions instead of missing Cronbach’s alpha (n = 49)
1. Headaches? 0.67 (0.95 – 0.39) 0.31 (0.57 – 0.03) 0.67 (0.94 – 0.40) 0.52 (0.79 – 0.25) 0.9409
2. Dizziness or faintness? 0.80 (1.00- 0.52) 0.25 (0.52 – -0.02) 0.80 (1.00 – 0.53) 0.80 (1.00 – 0.53) 0.9425
3. Pains in the heart or chest? 0.42 (0.68 – 0.16) 0.22 (0.49 – -0.05) 0.41 (0.16 – 0.66) 0.48 (0.75 – 0.21) 0.9386
4. Pains in the lower back? 0.61 (0.89 – 0.33) 0.52 (0.79 – 0.25) 0.62 (0.89 – 0.35) 0.61 (0.88 – 0.34) 0.9427
5. Nausea or upset in the stomach? 0.80 (1.00 – 0.52) 0.62 (0.89 – 0.35) 0.80 (1.00 – 0.53) 0.81 (1.00 – 0.54) 0.9412
6. Soreness of your muscles? 0.69 (0.97 – 0.41) 0.71 (0.98 – 0.43) 0.60 (0.87 – 0.33) 0.67 (0.94 – 0.40) 0.9395
7. Trouble getting your breath? 0.77 (1.00 – 0.52) 0.54 (0.76 – 0.32) 0.77 (1.00 – 0.52) 0.82 (1.00 – 0.28) 0.9394
8. Hot or cold spells? 0.69 (0.97 – 0.41) 0.69 (0.96 – 0.42) 0.69 (0.96 – 0.42) 0.69 (0.96 – 0.42) 0.9386
9. Numbness or tingling in parts of your body? 0.54 (0.78 – 0.30) 0.40 (0.62 – 0.18) 0.54 (0.77 - 0.31) 0.63 (0.90 – 0.36) 0.9412
10. A lump in your throat? 0.55 (0.82 – 0.30) 0.42 (0.66 – 0.16) 0.22 (0.47 – -0.03) 0.67 (0.94 – 0.40) 0.9388
11. Feeling weak in parts of your body? 0.72 (0.99 – 0.45) 0.50 (0.75 – 0.25) 0.69 (0.94 – 0.44) 0.71 (0.98 – 0.44) 0.9392
12. Heavy feelings in your arms or legs? 0.68 (0.95 – 0.41) 0.57 (0.82 – 0.32) 0.68 (0.93 – 0.43) 0.63 (0.90 – 0.36) 0.9389
13. Worries that there is something seriously wrong with your body? 0.72 (1.00 – 0.44) 0.52 (0.79 – 0.25) 0.72 (0.99 – 0.45) 0.69 (0.96 – 0.42) 0.9375
14. Worries that you suffer a disease you have read or heard about? 0.54 (0.82 – 0.26) 0.38 (0.65 – 0.11) 0.54 (0.81 – 0.27) 0.52 (0.79 – 0.25) 0.9402
15. Many different pains or aches? 0.60 (0.88 – 0.32) 0.47 (0.74 – 0.20) 0.60 (0.87 – 0.33) 0.45 (0.18 – 0.72) 0.9379
16. Worries about the possibility of having a serious illness? 0.71 (0.98 – 0.42) 0.51 (0.78 – 0.24) 0.71 (0.97 – 0.43) 0.67 (0.94 – 0.40) 0.9404
17. Many different symptoms? 0.64 (0.90 – 0.38) 0.38 (0.65 – 0.11) 0.62 (0.89 – 0.37) 0.61 (0.88 – 0.34) 0.9396
18. Thoughts that the doctor may be wrong if telling you not to worry? 0.58 (0.86 – 0.30) 0.35 (0.62 – 0.08) 0.58 (0.85 – 0.31) 0.58 (0.85 – 0.31) 0.9404
19. Worries about your health? 0.69 (0.97 – 0.41) 0.47 (0.74 – 0.20) 0.69 (0.96 – 0.42) 0.66 (0.93 – 0.39) 0.9389
20. Recurrent thoughts about you having an illness that you have trouble getting out of you head? 0.64 (0.90 – 0.38) 0.43 (0.70 – 0.16) 0.64 (0.91 – 0.37) 0.65 (0.92 – 0.38) 0.9399
21. Feeling suddenly scared for no reason? 0.75 (1.00 – 0.47) 0.50 (0.75 – 0.25) 0.75 (1.00 – 0.48) 0.73 (1.00 – 0.46) 0.9393
22. Nervousness or shakiness inside? 0.65 (0.93 – 0.37) 0.65 (0.92 – 0.38) 0.65 (0.92 – 0.38) 0.65 (0.92 – 0.38) 0.9376
23. Spells of terror or panic? 0.73 (1.00 – 0.46) 0.44 (0.71 – 0.17) 0.73 (1.00 – 0.46) 0.76 (1.00 – 0.49) 0.9407
24. That you worry too much? 0.84 (1.00 – 0.56) 0.82 (1.00 – 0.55) 0.78 (1.00 – 0.51) 0.80 (1.00 – 0.55) 0.9401
25. Feeling fearful? 0.67 (0.95 – 0.39) 0.67 (0.94 – 0.40) 0.67 (0.94 – 0.40) 0.67 (0.94 – 0.40) 0.9388
26. Feeling hopeless about the future? 0.84 (1.00 – 0.56) 0.70 (0.97 – 0.43) 0.84 (1.00 – 0.57) 0.84 (1.00 – 0.57) 0.9365
27. Feeling everything is an effort? 0.70 (0.98 – 0.42) 0.70 (0.97 – 0.43) 0.66 (0.93 – 0.39) 0.69 (0.96 – 0.42) 0.9373
28. Feeling blue? 0.73 (1.00 – 0.45) 0.45 (0.72 – 0.18) 0.73 (1.00 – 0.46) 0.72 (0.99 – 0.45) 0.9377
29. Feelings of worthlessness? 0.84 (1.00 – 0.56) 0.68 (0.95 – 0.41) 0.84 (1.00 – 0.57) 0.79 (1.00 – 0.52) 0.9372
30. Thoughts of ending your life? 0.97 (1.00 – 0.69) 0.68 (0.95 – 0.41) 0.97 (1.00 – 0.70) 0.97 (1.00 – 0.70) 0.9383
31. Feeling of being trapped or caught? 0.98 (1.00 – 0.70) 0.65 (0.92 – 0.38) 0.95 (1.00 – 0.68) 0.91 (1.00 – 0.64) 0.9373
32. Feeling lonely? 0.89 (1.00 – 0.60) 0.67 (0.92 – 0.42) 0.81 (1.00 – 0.54) 0.78 (1.00 – 0.51) 0.9376
33. Blaming yourself for things? 0.75 (1.00 – 0.47) 0.45 (0.72 – 0.15) 0.75 (1.00 – 0.48) 0.65 (0.92 – 0.38) 0.9400
Within the last year, have you ever……      
34. Felt you ought to cut down on your drinking? 0.89 (1.00 – 0.60)1 0.90 (1.00 – 0.63)1,2 0.89 (1.00 – 0.62)1,2 0.82 (1.00 – 0.59)1,4 0.9426
35. Been annoyed by people criticizing your drinking? 11 0.85 (1.00 – 0.58)1,2 11,2 0.41 (0.55 – 0.27)1,4  
36. Felt bad or guilty about your drinking? 0.79 (1.00 – 0.50) 1 0.63 (0.88 – 0.38)1,2 0.79 (1.00 – 0.52)1,2 0.47 (0.63 – 0.31)1,4 0.9415
37. Had a drink in the morning to steady your nerves or get rid of a hangover? 11 0.79 (1.00 – 0.51)1,2 11,2 0.39 (0.53 – 0.25)1,4  
38. Overall, would you say your health is: 0.56 (0.84 – 0.28) 0.53 (0.80 – 0.26)3 0.56 (0.83 - 0.29)3 0.52 (0.79 – 0.25)5 0.9392
  1. The second and third columns in Table 1 show the results of the analysis of weighted quadratic Kappa where the missing values have been changed to either the highest or the smallest possible score values in each question. The fourth column shows the results of changed missing data to individual mean scores.
  2. 1Analysed by Kappa as the questions require a dichotomous answer.
  3. 2Highest value is 1 and the smallest 0 (0–1).
  4. 3Highest value is 5 and the smallest 1 (1–5).
  5. 4The mean of the all responses to the question instead of the mean of the individual’s mean.
  6. 5The mean of the question instead of the individual mean as it was one question with the score from one to five.
  7. Missing data and weighted quadratic Kappa (IC) by the questions