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Aims: To compare two versions of a questionnaire translated using forward‐backward (FB) translation and dual‐panel (DP) methodologies regarding preference of wording and psychometric properties.
Methods: The Rheumatoid Arthritis Quality of Life instrument was adapted into Swedish by two independent groups using FB and DP methodologies, respectively. Seven out of thirty resulting items were identical...
Objectives: Psychometric development of the Retinopathy‐Dependent Quality of Life (RetDQoL) questionnaire in a cross‐sectional study of 207 German patients with diabetic retinopathy. Forty patients (19%) also had clinically significant macular edema.
Methods: Principal component analyses identified factor structure, and Cronbach's alpha assessed internal consistencies. Construct validity was examined...
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