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Table 3 Cronbach’s alpha coefficient, convergent and discriminant validity for the KIDSCREEN-27 and score domains for the Iranian school children

From: Item and response-category functioning of the Persian version of the KIDSCREEN-27: Rasch partial credit model

  Convergent validitya Discriminant validityb
Scale No. items n mean±SD α Range of correlation Scaling success (percent) Range of correlation Scaling success (percent)
Child self-report
Physical well-being 5 1083 51.65±11.32 0.79 0.62-0.76 5/5(100) 0.25-0.48 20/20(100)
Psychological well-being 7 1083 44.76±10.90 0.85 0.64-0.74 7/7(100) 0.16-0.57 28/28(100)
Autonomy and parent relation 7 1083 48.61±10.60 0.83 0.64-0.69 7/7(100) 0.27-0.51 28/28(100)
Social support and peers 4 1083 44.66±9.40 0.75 0.73-0.76 4/4(100) 0.23-0.43 16/16(100)
School environment 4 1083 51.32±9.94 0.73 0.63-0.77 4/4(100) 0.21-0.47 16/16(100)
Parent proxy-report
Physical well-being 5 1070 50.36±10.94 0.81 0.63-0.80 5/5(100) 0.24-0.49 20/20(100)
Psychological well-being 7 1070 44.05±12.22 0.83 0.65-0.74 7/7(100) 0.14-0.57 28/28(100)
Autonomy and parent relation 7 1070 49.25±11.78 0.81 0.59-0.69 7/7(100) 0.19-0.51 28/28(100)
Social support and peers 4 1070 45.67±10.93 0.77 0.73-0.82 4/4(100) 0.23-0.45 16/16(100)
School environment 4 1070 50.49±10.91 0.75 0.66-0.81 4/4(100) 0.22-0.47 16/16(100)
  1. a. Number of correlation between items and hypothesized scale corrected for overlap ≥ 0.4/ total number of convergent validity tests.
  2. b. Number of convergent correlations significantly higher than discriminant correlations/Total number of correlations.