Cohen 2003.

Methods	Design: randomised controlled trial
Participants	Number: 53 Age: mean 51.1 years (range 25 to 84) Gender: 15 men Setting: tertiary care centre Eligibility criteria: chronic vestibulopathy (labyrinthitis or neuronitis of more than 2 months) diagnosed by physician using posturography, calorics and oculomotor test battery Exclusion criteria: Ménière's disease, BPPV, acute vestibular neuronitis or labyrinthitis, significant orthopaedic limitations, a history of head trauma or neurologic disease, prior otologic disease or taking vestibular suppressants Baseline characteristics: no differences reported
Interventions	Intervention group: VR (slow head exercises ‐ habituation) (n = 13) Comparator group 1: VR (rapid head exercises) (n = 22) Comparator group 2: VR (rapid plus attention) (n = 18) VR versus VR versus VR
Outcomes	Primary outcome: VSS Secondary outcomes: VD‐ADL, VHQ, DHI, VI, VF
Notes	71 participants were recruited originally but this analysis only included those who completed all sessions and follow‐up assessments
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information about the sequence generation process
Allocation concealment (selection bias)	Unclear risk	Insufficient information about the method of allocation
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Outcomes were questionnaires and not likely to be affected by bias
Incomplete outcome data (attrition bias) All outcomes	Low risk	Reasons for drop‐outs following initial assessment were reported although final numbers in each group were not
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