収縮期血圧の正規偏差速算用計算図表

概要

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The author have constructed a nomogram which makes the calculation of normal deviate t=(B-Ba)/Sa, while a is the age of the test subject, B is the systolic blood pressure (mg/Hg), Ba is the average blood pressure of subjects in the same age group, and Sa is the standard deviation. The values of Ba and Sa were taken from the results of National Nutritional Survey conducted by Welfare Ministry in May 1963 . The equation may be rewritten as B+(-Sa)t=Ba . From this equation, the value of t was marked on the vertical line, using x=20, and y= +40t (in mm), while B was marked on the vertical line using x= -20, y=B. Age a was further marked on the curves (flexed line) in males and females separately, using x cosA= -20(40+Sa)/40-Sa while =A is the angle between X-axis and horizontal line, and y= 40Ba/40-Sa. A nomogram consisting of three scales, the scale of age showing a curve (flexed line) and the scales of B and t being two parallel straight lines is thus obtained. A nomogram which makes a rapid calculation of t logB-logBa/S'a possible after transforming systolic pressure into logarithm was also conducted, S'a represents the average of log(Ba+Sa) - logBa and logBa-log(Ba-Sa).
日本民族衛生学会の論文