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Table 2 Factor loadings

From: Impaired psychological recovery in the elderly after the Niigata-Chuetsu Earthquake in Japan:a population-based study

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