Forced vital capacity(FVC) and forced expiratory volume in one second(FEV,) were measured
s, 473 males and 413 females aged 8 to 21 years old who were healthy, non-smoking and attend-x:4 mg school in Seoul with Collins Survey Spirometer(Warren E. Collins, Inc., U. S. A.). The results
}here as follows;
h<.1. Prediction equations for FVC and FEV, were best expressed in a form of linear regression des"a function of height,´ respectively, for a group of children aged 8 to 12 years, whereas as a s~.ction of age, height and weight for those older than 13 years both in males and in females.
t
8 yr S ages 12 yr
M_ FVC
X´` FEV
L 13 yrS,age S 21 yr
FVC
FEV,
F 8 yrS ages 12 yr
E FVC
M FEV,
A 13 yr s ages 19 yr
L FVC
E \ FEV,
N Prediction Equation R2
214 0.0446Ht-3.9290 0.7961
0.0395Ht-3.4229 0.8072
259 0.0438Ht+0.0863Age+0.0181Wt-5.670 0.7002
0.0500Ht+0.0761Age+0.0084´Wt-6.336 0.6757
224 0.0393Ht-3.4249 0.7758
0.0350Ht-2.9568 0.7695
189, 0.0290Ht+0.0389Age+0.0178´Wt-3.005 0.4650
0.0288Ht+0.0511Age+0.0113Wt-3.053 0.4595
2. Mean difference between the measured and predicted values in each age group ranged 86 ml(1.1 %) - -54 ml(2.4 %) for FVC and 167 ml(3.1 %) 1110 ml(3.2 %) for FEV, in males acid 86 ml(4.3 %) -97 m l(4.6 %) for FVC and 91 ml(1.7 %) --125 ml(5.9 %) for FEV, in females.
3. Mean one second rate (FEVI%) were found to be 91.3 5.0 % aged 8 to 21 years in males and 93.5 4.8 % aged 8 to 19 years in females. There was a highly significant difference in FEV; % aged 8 to 19 years between male and female (p( 0.001).
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