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将正常老、中、青少年（６～７９岁）１２７０例流量－容积曲线（Ｆ－Ｖ曲线）的数据用ＩＢＭ－ＰＣ／ＸＴ电算机计算高中低肺容积处的切线时间常数τ＿（ｔ７５）、τ＿（ｔ５０）、τ＿（ｔ２５）。在青少年组：｜τ＿（ｔ７５）｜＞１ｓ，τ＿（ｔ７５）＞τ＿（ｔ５０）＞τ＿（ｔ２５），反映曲线的顶部呈圆凸形，曲线凹向容积轴。在老年组：｜τ＿（ｔ７５）｜＜１ｓ，τ＿（ｔ７５）＞τ＿（ｔ５０）＜τ＿（ｔ２５），显示曲线的顶部呈峰形，尾端凸向容积轴。中年组居于二者之间。由τ＿ｔ反映Ｆ－Ｖ曲线的形状与Ｍｅａｄ用斜率比（ＳＲ）所反映者一致。作者并对老人Ｆ－Ｖ曲线顶部出现峰形和尾端凸向容积轴的原因进行了讨论。
The tangential time constant τ_ (t75) at high, middle and low lung volumes was calculated using IBM-PC / XT computer from the data of 1270 flow-volume curves (F-V curves) , Τ_ (t50), τ_ (t25). In the adolescent group, | τ_ (t75) |> 1s, τ_ (t75)> τ_ (t50)> τ_ (t25), the top of the reflection curve is convex and the curve is concave toward the volume axis. In the elderly group, | τ_ (t75) | <1s, τ_ (t75)> τ_ (t50) <τ_ (t25) shows that the top of the curve has a peak shape and the trailing edge projects toward the volume axis. Middle-aged group live in between the two. The shape of the F-V curve reflected by τ_t is consistent with the one reflected by the slope ratio (SR) of Mead. The authors also discuss the reasons for the appearance of peaks at the top of the F-V curve and the bulge of the trailing end to the volume shaft.