30 Chapter 2 Data extraction Data extraction was conducted by one reviewer using a standardized extraction form and was checked by a second reviewer. This standardized extraction form is based on the patient-reported outcome (PRO)-specific checklist derived from the European Regulatory Issues on Quality of Life Assessment Working Group (ERIQA).11 Data extraction pertained to the secondary outcome measures: measurement properties and questionnaire characteristics of the identified questionnaires. The full Table 1: Inclusion and exclusion criteria used for the assessment of questionnaire eligibility as used in Search 2 INCLUSION CRITERIA EXCLUSION CRITERIA Exclusively closed-ended questions Presence of open-ended questions Adult population (≥ 18yrs) Paediatric population (< 18yrs) Copy of questionnaire available No copy of questionnaire available Availability of a development-, or validation paper in English No availability of a development-, or validation paper in English Questionnaire addressing otology complaints Proxy-reported questionnaires Table 2: Numbers of studies excluded per diagnostic group and reasons for exclusion. Each column represents a different symptom category. Q = questionnaire, OA = original article. See also Fig. 1, Search 2, exclusions [3] and [4] TINNITUS VERTIGO HEARING LOSS MULTIPLE COMPLAINT DYSGEUSIA ITCH No development/validation paper 13 15 34 3 - - Open-ended question(s) 7 2 25 - - - Q not self-administered 1 3 3 1 - - No description of development/ validation in OA 4 6 19 3 3 1 No definitive Q presented 1 - - - - - Off-topic 1 11 15 2 - - No English translation 3 2 3 - - - No Q availability 1 6 12 1 - - Paediatric Q - - 8 5 - - Not a Q 1 3 8 - - - 1-item Q 3 3 1 - - - Double Q 9 10 11 - - - Semi-structured Q - - 2 - - - Total 44 61 141 15 3 1
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