Asymmetry of responses to vestibulo-ocular tests in dizzy subjects and controls
| Test | Control subjects | Dizzy subjects | |||||
|---|---|---|---|---|---|---|---|
| Median | Interquartile range | Abnormal asymmetry ⩾10% (n (%)) | Median | Interquartile range | Abnormal asymmetry ⩾10% (n (%)) | ||
| Rotation testing: | |||||||
| Optokinetic | 0.100 | 0.04–0.15 | 2 (7.4) | 0.100 | 0.05–0.18 | 0 | |
| Sinusoidal | 0.150 | 0.05–0.26 | 6 (21.4) | 0.125 | 0.05–0.26 | 7 (19.4) | |
| Impulsive | 3.5 | 1–9 | 8 (34.8) | 5 | 2–12 | 4 (16.7) | |
| Caloric testing: | |||||||
| Canal paresis (EO) | 3.1 | 1.0–6.4 | 5 (17.9) | 2.5 | 0.8–6.4 | 3 (10.0) | |
| Canal paresis (EC) | 4.6 | 1.0–7.8 | 6 (21.4) | 5.6 | 1.9–7.8 | 4 (15.6) | |
| DP (EO) | 2.5 | 1.2–4.8 | 3 (10.7) | 2.2 | 1.2–4.8 | 4 (13.3) | |
| DP (EC) | 4.2 | 2.6–8.2 | 2 (7.1) | 3.7 | 2.6–8.2 | 4 (12.5) | |
Asymmetry on rotation tests was calculated by averaging difference in gain of responses to left and right. Asymmetry on the caloric test is represented by conventional calculations of percentage canal paresis and directional preponderance (DP).