The Four-Dimensional Symptom Questionnaire (4DSQ) in the general population: scale structure, reliability, measurement invariance and normative data: a cross-sectional survey.
Berend TerluinNiels SmitsEvelien P M BrouwersHenrica C W de VetPublished in: Health and quality of life outcomes (2016)
Evidence supports reliability and measurement invariance of the 4DSQ in the general Dutch population. The normative data provided in this study can be used to compare a subject's 4DSQ scores with a general population reference group.