1
Forced expiratory flow rates of 427 boys and 414 girls aged between 819 years old who
were attending primary, middle and high schools were measured with Collins Survey Spirometer tox with Eagle One Microprocessor (Warren E. Collins, Inc., U.S.A.). Spirograms and simultaneous
flow-volume curves were recorded on a kymograph and on a X-Y recorder (HP 7044b/7045b,
net, U.S.A.) attached to the spirometer, respectively. Simple indices for the forced expiratory flow
79j, rates were derived. The calculation of indices required minimal information on mean age, mean
with height, and mean values of each forced expiratory flow rates(PEFR, FEF2, , FEF,o , FEF15%, and
)Ive. FEF2J_75, ) to compare those groups which were different by many criteria such as smoking
89. habbits, degree of air pollution, occupation, ethnic classification, disease state, symptomatological
N state, etc.
The proposed indices are :
For Male For Female
1. Index PEFR PEFRAge-o 64 _ PEFRAge-o.,o
Height ´ .4s Height´. "
2 , Index FEF, FEF,5*y Ageo.s3 FEF2sx-Ageo is
_
Height 1 35 Height´ 95
3 . Index FEFso, _ FEFsoi´Ageo.4´ FEFsoi-Age-o.´s
Height ,.7s Height1 76
4. Index FEF-,5% = FEF75rAge-o.35 _ FEF75i-Age-o.34
Height"´ Height´ 14
5. Index FEF2s-7sss FEF2s-7s% Age` 42 FEF25-75r,Age-0.32
= ;
HeigbLy oo Height´ 81
Percentages of FEF25%, FEFso , FEF75,, FEF2575% and PEFR in each age group were 9095 9b, 6570 %, 35 %and 5560 % for males and 95 %v, 75 %, 4045% and 6570 % for females, respectively, indicating´ 5^-10 % higher values in female for each indices.
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