Multivariable analysis was performed to determine relation of cVEMP parameters to prognosis of benign paroxysmal positional vertigo (BPPV). Decreased cVEMP interaural amplitude difference (IAD) ratio on the affected side was related to resistance of BPPV to the repositioning maneuver. Affection of the posterior semicircular canal is also related to resistance of BPPV to the repositioning maneuver.