Validity Somatic Symptom Scale - 8

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1 validity

1.1 content validity
1.2 construct validity
1.3 factorial validity





validity
content validity

the content validity supposed high because items derived well-validated phq-15. in addition, zijlema et al. (2013) reviewed 99 scientific publications presented 40 instruments designed assess somatic symptoms, somatization, or medically unexplained symptoms. conclude valid measure of somatic symptom burden should include items cardiopulmonary (including autonomic symptoms), gastrointestinal, musculoskeletal, , general symptoms. sss-8 includes items 4 domains.


construct validity

the sss-8 showed positive associations measures of depression , anxiety. consistent previous studies demonstrated high co-morbidity of somatic, depressive, , anxious symptoms (i.e. somatization-anxiety-depression triad). moreover, high sss-8 scores associated poor self-reported general well-being , frequent health care use.


factorial validity

the sss-8 has higher order general factor structure. consists of general factor , 4 lower order facets (gastrointestinal symptoms, pain, cardiopulmonary symptoms, , fatigue). factor structure invariant age , gender.








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