Abstract
The area of sway, which is believed to be one of the most important parameters reflecting standing ability, be measured by planimeter. The Japanese Equilibrium Research Association recommends that. On the other hand, the product of the maximum widths in both X and Y directions is also used, since measurement by planimeter is difficult to use clinically. This paper aims to clarify the relationship between two methods. The area measured by plani meter and the product of the maximum widths in both X and Y directions are called A and B, respectively.Statokinesigrams of 500 patients aged 5 to 80 years with eyes open and eyes closed were analyzed and the correlation between A amd B was analyzed statisticaliv.1 ) With regression analysis, the correlation coefficient of A associated with B was determined to be: r=0.953 in the group with eyes open, r=0.968 in the group with eyes closed. Relationships between A and B in both groups were statistically significant at the level of 0.001.2) The data were fitted to the following regression equation: Y=0.443X-20.47 in the group with eyes open, Y=0.441X-5.689 in the group with eyes closed. (X=B, Y=A) The regression coefficients in both groups were significant (P<0.001).It is concluded that the area of a square, which encloses the figure of the sway, can be used as a substitute for the area measured by using a planimeter statistically. However, it is necessary to measure the area of the body sway by using a planimeter in some individuals directly, since the ratios of A to B showed values from 17.7 to 68.7 per cent.
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