56 Chapter 3 ‘elbow’ after the first factor. Therefore, EFA was repeated using one factor. All 12 items showed a factor loading >0.5. This factor was labelled as ‘impact’. This factor showed a high Cronbach’s Alpha (a = 0.913) which proves the coherency of items within this factor. Three items were removed based on expert opinion because they did not seem to measure what they were supposed to measure (item no. 44, 46 and 49). After deleting these items, this factor still showed a high Cronbach’s Alpha (a = 0.908). Based on the above analyses, the final version of OQUA was created. It consists of 34 items (Figure 1). Otology Questionnaire Amsterdam Figure 1: Thirty four-Item final version of the OQUA, 2018 (translated into English, original language Dutch). Each complaint has one question in VAS scale to score the severity of the complaint (0 = no complaint and 100 = worst imaginable complaints) and 18 questions with an ordinal adjectival rating scale answer category. Complaints 1. Indicate the severity of your earache on the line below. (Almost) never Sometimes Regularly Often (Almost) always 2. I have an earache 3. Indicate the severity of itching in or on your ear to the line below. (Almost) never Sometimes Regularly Often (Almost) always 4.. I have an itch in or on my ear. 5. Indicate the severity of your tinnitus (this can be a hum, murmur, beeping noise or buzzing sound) on the line below. (Almost) never Sometimes Regularly Often (Almost) always 6. I hear a hum, murmur, beeping noise or buzzing sound.
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