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The Factor Structure and Factorial Invariance of the 12-Item General Health Questionnaire (GHQ-12) Across Time

This study provides new knowledge about the factor structure of the 12-item General Health Questionnaire (GHQ-12; ) through the application of confirmatory factor analysis to longitudinal data, thereby enabling investigation of the factor structure, its invariance across time, and the rank-order stability of the factors. Two community-based longitudinal adult samples with 1-year ( = 640) and 6-year ( = 330) follow-up times were studied. As a result, the correlated 3-factor model (i.e., Anxiety/Depression, Social Dysfunction, and Loss of Confidence) showed a better fit with both samples than the alternative models. The correlated 3-factor structure was also relatively invariant across time in both samples, indicating that the scale has good construct validity. The rank-order stabilities of the factors were low across time, which suggests that the GHQ-12 measures temporal mental state. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Psychological Assessment PsycARTICLES®

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