Table 1 Cronbach's alpha coefficient, convergent and discriminant validity for the PedsQL^TM 4.0 Generic Core Scales and score domains for Iranian school children

No. items

n

Mean ± SD

α

Range of correlation

Scaling success (percent)

Range of correlation

Scaling success (percent)

23

938

77.18 ± 13.38*

0.85

-

-

-

-

8

938

78.32 ± 15.43*

0.70

0.31-0.67

87 (7/8)

0.10-0.42

96 (23/24)

5

938

68.46 ± 21.32

0.70

0.58-0.73

100 (5/5)

0.21-0.37

100 (15/15)

5

938

85.06 ± 17.07*

0.74

0.64-0.68

100 (5/5)

0.19-0.42

100 (15/15)

5

938

76.22 ± 18.78*

0.69

0.59-0.71

100 (5/5)

0.14-0.35

100 (15/15)

23

938

73.49 ± 16.65*

0.89

-

-

-

-

8

938

72.48 ± 20.79*

0.81

0.52-0.72

100 (8/8)

0.25-0.46

100 (24/24)

5

938

68.62 ± 21.85

0.74

0.63-0.77

100 (5/5)

0.25-0.38

100 (15/15)

5

938

80.03 ± 21.68*

0.79

0.66-0.77

100 (5/5)

0.26-0.50

100 (15/15)

5

938

73.47 ± 20.69*

0.70

0.55-0.79

100 (5/5)

0.15-0.45

100 (15/15)