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Table 2 Correlations between items in GHQ-12 scale, Inter-item reliability

From: Reliability and validity of general health questionnaire (GHQ-12) for male tannery workers: a study carried out in Kanpur, India

  Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Item 8 Item 9 Item 10 Item 11 Item 12 Inter-item Reliabilitya
Item 1 1             
Item 2 0.46 1.00            0.497
Item 3 0.73 0.50 1.00           0.523
Item 4 0.64 0.51 0.73 1.00          0.494
Item 5 0.49 0.60 0.50 0.48 1.00         0.506
Item 6 -0.70 -0.39 -0.70 -0.56 -0.38 1.00        0.524
Item 7 0.69 0.43 0.61 0.59 0.40 -0.60 1.00       0.510
Item 8 0.51 0.41 0.50 0.62 0.37 -0.49 0.56 1.00      0.503
Item 9 0.55 0.53 0.55 0.53 0.54 -0.50 0.44 0.30 1.00     0.530
Item 10 0.51 0.46 0.53 0.50 0.52 -0.48 0.48 0.29 0.64 1.00    0.505
Item 11 0.60 0.61 0.55 0.53 0.59 -0.47 0.55 0.39 0.69 0.66 1.00   0.512
Item 12 0.71 0.48 0.63 0.56 0.44 -0.62 0.69 0.41 0.57 0.43 0.53 1.00 0.504
  1. aAverage inter-item reliability: 0.50; Cronbach’s α coefficient: 0.93