“…Practically without exception, investigators from all over the world come to the same conclusion that (a) the SCL-90 is dominated by a general complaint factor and/or (b) that the dimensional structure of the scale seems to be unstable when testing that structure in different groups of respondents. These conclusions extend to the different norm groups, relevant for the use of the SCL-90: hospitalised psychiatric patients (Bonyinge, 1993;Carpenter & Hitner, 1995;Hafkenscheid, 1993;Rauter, Leonard & Swett, 1996), ambulant psychiatric patients (Hafkenscheid, 1993;Holi, Sammallahti & Aalberg, 1998;Schmitz, Hartkamp, Kiuse, Franke, Reister & Tress, 2000) and 'normals' (Holi et al, 1998;Vassend & Skrondal, 1999;Hessel, Schumeighter, Geyer & Bra¨hler, 2001).…”