Vital Capacity (with Vitalor) and Peak Flow Rate (Wright's) of Inlanders

2. Prediction Formulas for the Normal Values for Adults (Aged 30.79 Years)

Abstract

With 2, 111 adult men and 2, 789 women (aged 30-79 years) inhabiting Gunma Prefecture, FVC and FEV1.0 were measured with the vitalor, and PFR with the Wright's peak flow meter, and prediction formulas for estimating the normal values were presented from the measured values. The prediction formulas obtained by the multiple regression equations between vitalor values (or PFR) on one hand and age and height on the other, as classified by sex. The followings are the main findings : 1) Formulas for estimating FVC (for subjects aged 30-79) For males : Y = 68.6 × Ht -17.9 × age - 6777.5 For females : Y = 18.0 × Ht - 20.6 × age - 656.9 Y:estimated FVC (ml), Ht : height in cm 2) Formulas for estimating FEV1.0 (for subjects aged 30-79) For males : Y = 52.6 × Ht - 20.1 × age - 4728.6 For females : = 66.1 × Ht - 6.0 × age - 7604.6 Y : estimated FEV1.0 (ml) 3) Formulas for estimating PFR (for subjects aged 40-79) For males : Y = 7.4 × Ht - 3.6 × age - 503.6 For females : Y = 4.1 × Ht - 2.6 × age - 125.5 Y : estimated PFR (ι/min.) 4) The values estimated by these formulas were used examples for Japanese inlanders to be compared with those of residents Yokohama city (reported by Oda 1973), which were, the only available data of coastal inhabitants at present. It was found as the result, that FVC decline with age showed a similar pattern in n both examples, but that the authors' estimated PVC was about 300 ml higher that for the coastal inhabitants.