Di Fabio's article1 is a serious and careful evaluation of the relationship between static posturography (SPG) and dynamic posturography (DPG) and other vestibular tests (electronystagmography [ENG] or rotational tests [ROT]). Combining the results from multiple studies increases our ability to draw appropriate conclusions regarding the meaning of abnormal SPG and DPG test results. Nevertheless, I do not believe that the studies he reviewed demonstrate the clinical usefulness of SPG and DPG, and I believe there is a statistical error in his analysis of "effect size."
For each study reviewed, a 2×2 table was constructed, including cells for true positives, false positives, false negatives, and true negatives. The criterion standard (or "gold standard") was the result of ENG or ROT. This analysis is appropriate to answer the question of correlation between posturography (SPG and DPG) and other tests (ENG and ROT); positive correlation strengthens the belief that these 2 classes