Cohen 2005.

Methods	Design: randomised controlled trial
Participants	Number: 124 Age: 58.3 years (SD 12.8) Gender: 48 males Setting: hospitals Eligibility criteria: unilateral BPPV (post SC) diagnosed by physician (D‐H test), with dizziness for at least 1 week Exclusion criteria: those with whiplash, head trauma, significant orthopaedic, neurological and other otologic disorders Baseline characteristics: not reported
Interventions	Intervention group: B‐D exercises (n = 25) Comparator group 1: habituation exercises (n = 25) Comparator group 2: CRM (n = 24) Comparator group 3: LM (n = 25) Comparator group 4: sham manoeuvre (n = 25) VR versus other (CRMs) versus placebo
Outcomes	Primary outcome: VI Secondary outcomes: VF, posturography
Notes	24 participants dropped out of the study for a variety of reasons and their data were not included in the analysis
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Randomisation was computer‐generated by the senior investigator
Allocation concealment (selection bias)	Unclear risk	Insufficient information about the method of allocation
Blinding (performance bias and detection bias) All outcomes	Low risk	Outcome assessors were blinded to group allocation
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	16% of participants dropped out of the study with reasons. Further drop‐outs after the first post‐test assessment were not adequately described (at 3 and 6 months)
Selective reporting (reporting bias)	Low risk	Study protocol not available but all data appear to be reported
Other bias	Low risk	The study appears to be free of other sources of bias