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Table 1 Pearson correlations between all items (PP items p1 to p6; NP items n1 to n6)

From: The factor structure of the twelve item General Health Questionnaire (GHQ-12): the result of negative phrasing?

  p2 p3 p4 p5 p6 n1 n2 n3 n4 n5 n6
p1 0.43 0.41 0.47 0.43 0.39 0.37 0.38 0.38 0.39 0.40 0.36
p2 - 0.49 0.43 0.40 0.38 0.27 0.25 0.34 0.33 0.38 0.39
p3 - - 0.36 0.47 0.38 0.24 0.24 0.33 0.28 0.36 0.32
p4 - - - 0.50 0.41 0.32 0.37 0.40 0.39 0.38 0.35
p5 - - - - 0.48 0.33 0.36 0.42 0.41 0.42 0.41
p6 - - - - - 0.39 0.40 0.42 0.51 0.48 0.49
n1 - - - - - - 0.58 0.54 0.57 0.51 0.44
n2 - - - - - - - 0.60 0.60 0.53 0.44
n3 - - - - - - - - 0.60 0.60 0.54
n4 - - - - - - - - - 0.69 0.58
n5 - - - - - - - - - - 0.71