[The Six Factor Test--a personality questionnaire for clinical practice and research].

BACKGROUND: The Six factor Test (SFT) is a personality questionnaire for assessment of the "big five" (neuroticism, extraversion, conscience, aggressivity, openness to experiences) and piety in patients with mental disorders and healthy subjects.
METHODS: In a study of 360 probands (125 depressive and bipolar patients, 150 first-degree relatives of these patients, and 85 controls), the reliability and validity of the SFT was examined. Thirty-five controls and 79 relatives were reinvestigated after around 6.5 years.
RESULTS: The factorial structure could be replicated, and the concurrent validity was moderate to high. Acceptable internal consistency was observed, with the exceptions of "openness" and "agreeableness". The retest reliability was high, with the exception of "openness". Patients differed from controls in neuroticism and "openness". These factors were also predictive for the first onset of psychiatric disorders in controls and relatives, respectively.
CONCLUSION: The SFT is a short und simple instrument for the assessment of personality in clinical samples and controls. Reliability and validity of the three main scales (neuroticism, extraversion, and conscience) were acceptable. The corresponding coefficients of the three shorter scales, in particular of openness, were partly much lower.