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
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) |