Article2001

Assessing psychological distress in patients with skin diseases: reliability, validity and factor structure of the GHQ‐12

Angelo Picardi · DAMIANO D ABENI · Pietro Pasquini

134 citations0/0 files storedJournal of the European Academy of Dermatology and Venereology

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Psychometric Methodologies and Testing Dermatology and Skin Diseases Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes

Abstract

OBJECTIVE: We studied reliability, validity and factor structure of the 12-item General Health Questionnaire (GHQ-12) in dermatological patients. METHOD: Subjects attending a dermatological outpatient clinic were administered the GHQ-12 and the Skindex-29. A random subsample was mailed another copy of the questionnaires to be completed within 1 week. RESULTS: A total of 2,579 subjects completed the GHQ-12. The internal consistency of the GHQ-12 was high (Cronbach's alpha = 0.88). Test-retest reliability on 137 subjects was also fairly satisfactory (intraclass correlation coefficient = 0.72), notwithstanding a re-test artefact probably related to reassurance from the physician. Evidence of construct validity was provided by the pattern of correlation between scores on the GHQ-12 and on the scales of Skindex-29, which were as hypothesized. Also, GHQ-12 scores of patients in different clinical groups varied as hypothesized, with patients affected by inflammatory skin diseases scoring significantly higher than patients with isolated skin lesions. We obtained both a two-factor and a three-factor solution: the latter seemed theoretically more appropriate, although the first may have practical advantages. A 'social dysfunction' factor emerged in both analyses, while the other items loaded on a 'general dysphoria' factor or on two separate factors interpreted as 'anxiety' and 'loss of self-esteem'. CONCLUSIONS: The GHQ-12 is a reliable and valid instrument with a factor structure that is quite stable across different samples as well as across diverse cultures. Its brevity and easiness of completion make it a useful tool to assess psychological distress in dermatological patients.

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References

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