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Table 1 Item scaling test: convergent and discriminant validity for KINDL subscales in children and their parents

From: Assessing whether child and parent reports of the KINDL questionnaire measure the same constructs of quality of life in children with attention-deficit hyperactivity disorder

  Items Mean ± SDa Floor effect (%) Ceiling effect (%) Cronbach’\(\alpha\) Convergent validityb Discriminant validityc
Range of correlation Scaling success (%) Range of correlation Scaling success (%)
Child self-reports
Physical well-being 4 70.39 ± 21.21 6.1 37.7 0.67 0.63–0.75 4/4 (100) 0.006–0.49 20/20 (100)
Emotional well-being 4 68.90 ± 23.29 6.3 40.2 0.72 0.67–0.77 4/4 (100) 0.03–0.50 20/20 (100)
Self-esteem 4 58.61 ± 26.00 13.9 29.7 0.74 0.71–0.83 4/4 (100) 0.001–0.33 20/20 (100)
Family 4 66.34 ± 23.60 8.6 35.7 0.70 0.68–0.76 4/4 (100) 0.06–0.38 20/20 (100)
Friends 4 66.44 ± 24.44 10.6 37.7 0.70 0.66–0.81 4/4 (100) 0.06–0.45 20/20 (100)
School 4 63.52 ± 26.35 13.1 38.1 0.73 0.73–0.76 4/4 (100) 0.01–0.37 20/20 (100)
Total score 24 65.70 ± 15.53        
Parent proxy-reports
Physical well-being 4 65.65 ± 19.67* 3.3 26.0 0.70 0.61–0.79 4/4 (100) 0.03–0.34 20/20 (100)
Emotional well-being 4 59.94 ± 19.31* 4.1 20.9 0.67 0.62–0.79 4/4 (100) 0.005–0.31 20/20 (100)
Self-esteem 4 52.26 ± 21.77* 8.3 13.2 0.76 0.69–0.82 4/4 (100) 0.03–0.32 20/20 (100)
Family 4 53.44 ± 20.59* 8.1 14.2 0.76 0.68–0.76 4/4 (100) 0.01–0.44 20/20 (100)
Friends 4 58.02 ± 20.27* 7.1 17.7 0.70 0.64–0.82 4/4 (100) 0.01–0.34 20/20 (100)
School 4 49.11 ± 22.50* 14.6 14.6 0.73 0.69–0.77 4/4 (100) 0.002–0.31 20/20 (100)
Total score 24 56.41 ± 12.14*        
  1. astandard deviation
  2. bNumber of correlation between items and hypothesized scale corrected for overlap ≥ 0.4/ total number of convergent validity tests
  3. cNumber of convergent correlations significantly higher than discriminant correlations/Total number of correlations
  4. *Indicates that the corresponding subscales between child and parent reports are statistically significant (p values < 0.05)