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Fig. 1 | BMC Family Practice

Fig. 1

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

Fig. 1

Differential test functioning (DTF) of the 4DSQ-scales. Raw 4DSQ scale scores as a function of the DIF-adjusted theta scores for distress, depression, anxiety and somatization, by language group (red curves: Turkish, blue curves: Dutch). Conventional Dutch cut-off points and corresponding Turkish cut-off points are indicated by dashed lines. The vertical distance between the Dutch and corresponding Turkish cut-off points indicate differential test functioning

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BMC Primary Care

ISSN: 2731-4553

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