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Table 3 Inter-rater reliability results for the German version of the QoL-AD proxy (proxy-proxy perspective) and QoL-AD NH proxy (proxy-person perspective)

From: Item distribution and inter-rater reliability of the German version of the quality of life in Alzheimer’s disease scale (QoL-AD) proxy for people with dementia living in nursing homes

QoL-AD poxy (n = 39) f ICC (95% CI): 0.65 [0.79 (0.42–0.80) a
(0.60–0.89)] b
QoL-AD NH proxy (n = 62) f ICC (95% CI): 0.18
[0.31
(− 0.05–0.40) a
(− 0.10–0.57)] b
(without item 12, n = 65) ICC (95% CI): 0.63 [0.77 (0.45–0.76) a
(0.62–0.86)] b
No. How do you judge … poc κw (95% CI) d No. How do you think the resident would judge his/her … poc κw (95% CI) d
1. … the physical health of the resident? 0.49 0.36 (0.19–0.51) 1. … physical health? 0.44 0.30 (0.12–0.46)
2. … the energy of the resident? 0.45 0.32 (0.16–0.47) 2. … energy? 0.37 0.08 (−0.09–0.25)
3. … the mood of the resident? 0.51 0.33 (0.18–0.48) 3. … mood? 0.35 0.11 (−0.07–0.28)
4. … the living situation of the resident? 0.59 0.19 (0.05–0.34) 4. … living situation? 0.29 −0.03 (−0.16–0.11)
5. … the memory of the resident? 0.49 0.21 (0.03–0.39) 5. … memory? 0.44 0.16 (−0.01–0.33)
6. … the family of the resident? 0.52 0.55 (0.41–0.67) 6. … family? 0.39 0.30 (0.13–0.46)
7. … the marriage of the resident? 0.47 0.37 (0.20–0.53)      
8. … the friends of the resident? 0.40 0.19 (0.01–0.36) 7. … friends? 0.30 0.11 (−0.07–0.28)
9. … his−/herself as a whole? 0.49 0.15 (−0.03–0.32) 8. … -self overall? 0.44 0.05 (−0.09–0.2)
10. … the ability of the resident to do chores around the house? 0.56 0.23 (0.08–0.38) 9. … ability to keep busy? 0.38 0.07 (−0.10–0.24)
11. … the ability of the resident to do things for fun? 0.42 0.18 (0.02–0.33) 10. … ability to do things for fun? 0.36 −0.01 (−0.19–0.18)
12. … the money of the resident? 0.33 0.07 (−0.11–0.25)      
      11. f… people who work here? 0.43 0.11 (−0.06–0.27)
      12. … ability to take care of him−/herself? 0.33 0.12 (−0.04–0.27)
      13. … ability to live with others? 0.42 0.16 (0.00–0.31)
      14. … ability to make choices in his/her life? 0.36 0.11 (−0.04–0.27)
13. … life as a whole? 0.63 0.36 (0.19–0.53) 15. … life as a whole? 0.55 0.38 (0.19–0.53)
  1. aIntra-class correlation coefficient and corresponding 95% CI
  2. bAverage-measure ICC for two raters in parentheses and corresponding 95% CI
  3. cOverall proportion of agreement (the ratio of exact agreement between raters)
  4. dLinear weighted Kappa values. CIs were based on 10,000 bootstrapped samples
  5. eItem with floor effect, the mean is in the first 20% of the scale (< 1.6), see Table 2
  6. fComplete case analysis