@article{3193662,
    title = "The use of the Symptom Checklist 90-R in exploring the factor structure
of mental disorders and the neglected fact of comorbidity.",
    author = "Kostaras, Panagiotis and Martinaki, Sofia and Asimopoulos, Charis and and Maltezou, Maria and Papageorgiou, Charalambos",
    journal = "Psychiatry Research",
    year = "2020",
    volume = "294",
    publisher = "Elsevier Ireland Ltd",
    issn = "0165-1781",
    doi = "10.1016/j.psychres.2020.113522",
    keywords = "Symptom Checklist 90-R (SCL-90-R); comorbidity; bi-factor model; second
order factor model; confirmatory factor analysis; psychopathology",
    abstract = "The Symptom Checklist 90-R (SCL-90-R) is a popular instrument, accessing
nine different symptom clusters of psychopathology, although its
original factor structure is widely questioned. However, most validation
studies seem to ignore the possible effect of comorbidity. We aimed at
validating the factor structure of the SCL-90-R and to draw additional
information about the role of comorbidity in the factor structure of
mental disorders. We thus introduced a comorbidity index within the
SCL-90-R and validated the Greek version of the SCL-90-R in a sample of
914 participants, consisting of 688 individuals from the general
population and 226 psychiatric outpatients. We showed that the original
9-factor model was superior to the second order factor and the bi-factor
model. This may reflect lower comorbidity traits in our sample, rather
than the accuracy of the original 9-factor structure of the SCL-90-R,
which has to be further assessed by concurrent validity for each
individual scale on selected samples. In this regard, we showed that the
depression subscale was an excellent screening tool in a subgroup of
patients with a confirmed major depressive episode."
}