Cross-cultural validation of the Turkish Four-Dimensional Symptom Questionnaire (4DSQ) using differential item and test functioning (DIF and DTF) analysis

The Four-Dimensional Symptom Questionnaire (4DSQ) is originally a Dutch 50 item questionnaire developed in primary care to assess distress, depression, anxiety and somatization. We aimed to develop and validat...

Source: BMC Family Practice - May 11, 2016 Category: Primary Care Authors: Berend Terluin, Pemra C. Unalan, Nurver Turfaner Sipahioğlu, Seda Arslan Özkul and Harm W. J. van Marwijk Source Type: research