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Table 3 Examples of questionnaires measuring primary outcomes for this review. This list will be updated if other questionnaires are introduced

From: Internet-based interventions for adults with hearing loss, tinnitus and vestibular disorders: a protocol for a systematic review

Measurement instrument (author, year) Number of items and subscales Internal consistency (Cronbach’s alpha for the global score)
Hearing handicap
 Hearing Handicap Inventory for the Elderly [85] 25 items, 2 subscales a = 0.93
 Hearing Handicap Questionnaire [86] 27 item, 3 subscales a = 0.94
Tinnitus distress/severity
 Tinnitus Handicap Inventory [87] 25 items, 3 subscales a = 0.93
 Tinnitus Questionnaire [88] 52 items, 5 subscales a = 0.94
 Tinnitus Reaction Questionnaire [89] 26 items, 4 subscales a = 0.96
 Tinnitus Functional Index [90] 25 items, 8 subscales a = 0.97
 Tinnitus Handicap Questionnaire [91] 27 items, 3 subscales a = 0.94
Vertigo/dizziness
 Vertigo Symptom Scale-Short Form [92] 36 items, 2 subscales a = 0.90
 Vestibular Rehabilitation Benefit Questionnaire [93] 36 item, 4 subscales a = 0.73
 Dizziness Handicap Inventory [94] 25 items, 3 subscales a = 0.89
 Vertigo Handicap Questionnaire [95] 25 items, 4 subscales a = 0.93