Table 2

Descriptive statistics, reliability and discrimination estimates for Model 3

Scoring method

Scale mean

Scale SD

Alpha (α)

Implied r2

Difference (α-implied r2)

SEM

Delta (δ)


Likert

10.6

4.9

0.90

0.73

0.17

2.6

0.94

GHQ

1.4

2.7

0.90

0.87

0.03

0.9

0.63

C-GHQ

4.0

3.0

0.75

0.53

0.22

2.0

0.97


Hankins BMC Public Health 2008 8:355   doi:10.1186/1471-2458-8-355

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