General Health Questionnaire (GHQ12 & GHQ28): psychometric properties and factor structure of the scales in a Turkish primary care sample.

The General Health Questionnaire is a widely used screening instrument. It detects a wide range of psychological disorders, mainly the anxiety/depression spectrum, and has been shown to be a valid and reliable instrument across cultures. This study reports the psychometric properties of the 12- and 28-item versions of the questionnaire among Turkish primary care attenders, focusing mainly on the factor structures. Both questionnaires were found to be reliable and they had factor structures consistent with the original studies.