Table 2

Factor loadings

GHQ-12 items

GHQ

Likert

C-GHQ

F1

F2

F1

F2

F1

F2


1. Able to concentrate

0.68

-

0.66

-

0.66

-

2. Lost much sleep

-

0.62

-

0.65

-

0.62

3. Playing a useful part

0.69

-

0.71

-

0.70

-

4. Capable of making decisions

0.77

-

0.81

-

0.75

-

5. Under stress

-

0.71

-

0.76

-

0.76

6. Could not overcome difficulties

-

0.69

-

0.71

-

0.75

Before earthquake

7. Enjoy normal activities

0.76

-

0.72

-

0.78

-

8. Face up to problems

0.72

-

0.77

-

0.74

-

9. Feeling unhappy and depressed

-

0.82

-

0.84

-

0.81

10. Losing confidence

-

0.72

-

0.78

-

0.81

11. Thinking of self as worthless

-

0.48

-

0.52

-

0.58

12. Feeling reasonably happy

-

-

-

-

-

-

Inter-factor correlation

0.43

0.43

0.13

1. Able to concentrate

0.76

-

0.73

-

0.76

-

2. Lost much sleep

-

0.55

-

0.63

-

0.59

3. Playing a useful part

0.73

-

0.79

-

0.80

-

4. Capable of making decisions

0.77

-

0.81

-

0.81

-

5. Under stress

-

0.58

-

0.78

-

0.79

6. Could not overcome difficulties

-

0.66

-

0.73

-

0.82

Most stressful time

7. Enjoy normal activities

0.80

-

0.69

-

0.80

-

8. Face up to problems

0.83

-

0.84

-

0.85

-

9. Feeling unhappy and depressed

-

0.84

-

0.89

-

0.85

10. Losing confidence

-

0.78

-

0.76

-

0.82

11. Thinking of self as worthless

-

0.49

-

0.48

-

0.48

12. Feeling reasonably happy

-

-

-

-

-

-

Inter-factor correlation

0.74

0.71

0.40

1. Able to concentrate

0.77

-

0.73

-

0.77

-

2. Lost much sleep

-

0.70

-

0.72

-

0.63

3. Playing a useful part

0.82

-

0.79

-

0.82

-

4. Capable of making decisions

0.83

-

0.81

-

0.84

-

5. Under stress

-

0.78

-

0.82

-

0.76

6. Could not overcome difficulties

-

0.66

-

0.77

-

0.80

Now

7. Enjoy normal activities

0.73

-

0.71

-

0.80

-

8. Face up to problems

0.78

-

0.77

-

0.83

-

9. Feeling unhappy and depressed

-

0.85

-

0.91

-

0.86

10. Losing confidence

-

0.72

-

0.85

-

0.86

11. Thinking of self as worthless

-

0.40

-

0.47

-

0.55

12. Feeling reasonably happy

-

-

-

-

-

-

Inter-factor correlation

0.73

0.70

0.30


Factor analysis was conducted for GHQ-12 scores at three points of time. GHQ-12 was scored by using the three different methods.

Toyabe et al. BMC Public Health 2006 6:230   doi:10.1186/1471-2458-6-230

Open Data