Foster 2012.

Methods	Design: randomised controlled trial
Participants	Number: 68 Age: not reported Gender: 19 males Setting: university outpatient clinic Eligibility criteria: adults with a history suggestive of BPPV and Dix‐Hallpike manoeuvre consistent with unilateral posterior canal BPPV Exclusion criteria: those with cupulolithiasis, horizontal canal BPPV, bilateral BPPV, nystagmus due to central or other peripheral vestibular disorders, those without nystagmus on the D‐H, those unable to bend the neck or turn the head safely, or sit up, lie down, roll over or kneel on hands and knees, or those who could not tolerate the D‐H, the CRM or assume the half‐somersault position Baseline characteristics: not reported
Interventions	Intervention group: half‐somersault manoeuvre was performed twice in the clinic and also given as a home exercise (n = 33) Comparator group: Epley manoeuvre was performed twice in the clinic and also given as a home exercise (n = 35) VR versus VR
Outcomes	Primary outcome: nystagmus intensity score Secondary outcome: BPPV recurrence
Notes	All participants completed the study
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "Researcher... assigned them via a randomised list prepared by a statistician"
Allocation concealment (selection bias)	Low risk	Participants were removed to another training room prior to randomisation to treatment group
Blinding (performance bias and detection bias) All outcomes	Low risk	Outcome assessors were blinded to group allocation
Incomplete outcome data (attrition bias) All outcomes	Low risk	At 6‐month follow‐up 5 participants dropped out from the Epley group and 6 from the half‐somersault group
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