Nonlinearity of the Jongkees difference equation for vestibular hypofunction

The Jongkees formulation for vestibular paresis normalizes the difference between total left and right caloric responses to the sum of responses. When studied over the full paresis range of 0% to 100% hypofunction, the Jongkees formula is found to be a nonlinear index that does not accurately indicate the percentage of vestibular paresis. A linear paresis formula is described that more directly conveys the magnitude of relative vestibular hypofunction.