In this particular study we only used validated questionnaires (as recommended) but in our previous efficacy trial (reference below) we did ask the simple question of whether people felt better, worse or unchanged, and 6 months post-treatment 69.0% of the treated patients said they felt better compared with 37.1% of controls. Although complete ‘cure’ is rare in treatment for chronic dizziness, in the current study we do report figures for ‘cured’, i.e. ‘at three month follow-up 19/82 (23%) people in the vestibular rehabilitation group had no provoked symptoms at all, compared with 5/87 (6%) in the usual medical care group (relative risk = 4.03; 1.58 to 10.30).’

Yardley, L., Beech, S., Zander, L., Evans, T. & Weinman, J. (1998). A randomised controlled trial of exercise therapy for dizziness and vertigo in primary care. British Journal of General Practice, 48, 1136-1140.