Abstract
To calculate the predicted vital capacity (VC-pr), eight standard formulae are used in Japan. It is appropriate to use more than one formula, because the age correlated change of the vital capacity is not monotonic. However more formulae make it more complicated to calculate the VC-pr. From this point of view, the nomogram which can be used in most ages was developed.
The nomogram reported in this report covers the eight standard formulae used in Japan and is applicable in most ages (from 6 to 80 years old) regardless of sex.
The height axis, VC-pr axis and the axis of measured vital capacity are drawn using an equal interval scale. Therefore, interpolation of the scales and enlargement of the ranges of the scales are easy. The scale of age axis expresses the contribution of age to VC-pr variation much more than former nomograms.
The axes are arranged according to the sequence of use, to prevent error.
