Despite voluminous research on mental disorders conducted on several levels with numerous variables, other potentially significant variables often are implied but seldom investigated. Most non-organically oriented studies have dealt with psychological variables. Research investigating socio-cuhural variables has paid particular attention to social status. This paper suggests that investigations of socio-economic aspects of mental disorders--especially when directed toward etiology--are implicitly concerned with value systems, a related concept. But since value systems are more abstract than socio-economic status, a more easily operationalized intermediate variable--yet one more closely representing value systems--may be useful. Ethnicity is suggested for this purpose.
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