Psychometric Properties of the Russian Version of the Somatic Symptom Disorder — B Criteria Scale

Abstract

Background: in foreign science and practice, the Somatic Symptom Disorder — B Criteria Scale (SSD-12) is actively used in the diagnosis of cognitive, affective, and behavioral aspects of somatization, as well as in screening and monitoring of somatoform disorder in the general population and in patients seeking primary health care. The aim of study: adaptation of the Russian version of the SSD-12 in the general population. Participants and methods: the sample consisted of 1,535 respondents who filled out, in addition to the SSD-12, a set of diagnostic measures assessing anxiety (Generalized Anxiety Disorder-7, GAD-7), depression (Patient Health Questionnaire-9, PHQ-9), and somatization (Somatic Symptom Scale-8, SSS-8). Results: the adapted scale has a three-factor structure that allows diagnosing cognitive, affective, and behavioral aspects of somatization (SB χ2 (51) = 656, p < 0,001; CFI = 0,942; TLI = 0,925; SRMR = 0,037; RMSEA = 0,088 (CI 95% 0,082–0,094)). The reliability has been proven using acceptable internal consistency. The validity was confirmed by the expected correlations between somatization according to the SSD-12 and SSS-8, anxiety according to the GAD-7, and depression according to the PHQ-9. The specificity and sensitivity were determined using ROC curves for cognitive, affective, and behavioral aspects of somatization. Conclusion: the Russian version of the SSD-12 is psychometrically consistent and can be recommended as a diagnostic instrument for assessing of cognitive, affective, and behavioral aspects of somatization in the general population.