The main objective of this study is to analyze the psychometric properties of the General Health Questionnaire (GHQ-12) as a screening instrument in a representative sample of the Spanish population, and among people older than 65 years. This is a instrumental study using data from the National Health Survey of Spain (2006). The sample include 29,476 non-institutionalized interviewed persons over 16 years. Correlation analysis was carried out between items, internal consistency analysis, exploratory factor analysis (EFA) and a discussion of external validity of GHQ-12. All analyzes were performed using two scoring methods (Likert and GHQ). The results showed that the GHQ-12 has a high internal consistency in the general population and in people older than 65 years. Each of the items in the GHQ correlated with others, showing correlation values greater than.51. Exploratory factor analysis confirmed that much of the variability of the instrument (67% Likert and 73% GHQ) may be explained by gathering all the items into a single factor. The factor analysis confirmed that the GHQ-12 can be used as a unidimensional screening and scoring most appropriate in this case. © International Journal of Clinical and Health Psychology.
|Journal||International Journal of Clinical and Health Psychology|
|Publication status||Published - 1 Jan 2011|
- General health questionnaire
- Health surveys
- Instrumental study
- Mental health screening