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Table 3 Item scaling tests: convergent and discriminant validity for the PedsQL™ 4.0 Generic Core Scales and the PedsQL™ 3.0 Diabetes Module subscales

From: Health related quality of life of Iranian children with type 1 diabetes: reliability and validity of the Persian version of the PedsQL™ Generic Core Scales and Diabetes Module

   Convergent validitya Discriminant validityb
Scale No.
items
Range of
correlation
Scaling success
(percent)
Range of correlation Scaling success
(percent)
PedsQL™ 4.0 Generic Core Scales      
Child self-report      
Physical health 8 0.52-0.72 8/8 (100) 0.05-0.47 20/24 (83)
Emotional functioning 5 0.48-0.75 5/5 (100) 0.07-0.46 12/15 (80)
Social functioning 5 0.65-0.73 5/5 (100) 0.18-0.54 13/15 (87)
School functioning 5 0.51-0.79 5/5 (100) 0.11-0.34 15/15 (100)
Parent proxy-report      
Physical health 8 0.36-0.72 7/8 (87.50) 0.006-0.46 19/24 (79)
Emotional functioning 5 0.60-0.80 5/5 (100) 0.004-0.37 15/15 (100)
Social functioning 5 0.51-0.82 5/5 (100) 0.07-0.47 14/15 (93)
School functioning 5 0.46-0.81 5/5 (100) 0.005-0.47 13/15 (87)
PedsQL™ 3.0 Diabetic Module      
Child self-report      
Diabetes symptoms 11 0.37-0.66 10/11 (90.91) 0.001-0.42 28/44 (64)
Treatment barriers 4 0.63-0.75 4/4 (100) 0.26-0.74 14/16 (88)
Treatment adherence 7 0.58-0.82 7/7 (100) 0.16-0.62 21/28 (75)
Worry 3 0.70-0.85 3/3 (100) 0.22-0.61 12/12 (100)
Communications 3 0.76-0.87 3/3 (100) 0.25-0.50 12/12 (100)
Parent proxy-report      
Diabetes symptoms 11 0.43-0.65 11/11 (100) 0.002-0.42 39/44 (89)
Treatment barriers 4 0.58-0.83 4/4 (100) 0.19-0.57 14/16 (88)
Treatment adherence 7 0.54-0.71 7/7 (100) 0.01-0.54 23/28 (82)
Worry 3 0.75-0.84 3/3 (100) 0.20-0.50 12/12 (100)
Communications 3 0.69-0.86 3/3 (100) 0.13-0.49 12/12 (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.