With the exception of Zung’s own studies, most research has shown that the SDS discriminates only moderately well between diagnostic groups (3). When used as a screening test, sensitivity and specificity seem adequate, although somewhat lower than for other self-rating scales. Recent reviews of the SDS are generally negative. Boyle and others view it as “a psychometrically crude instrument” that should not be used in research (3, p54; 8; 40, p54), whereas Rabkin and Klein stated that it is not the instrument of choice for assessing depressive severity or change after treatment, although it may have a role as an adjunctive screening instrument (41). The Center for Epidemiologic Studies Depression Scale (CES-D) (L.S. Radloff and the National Institute of Mental Health, USA, 1972)