|
Overview :
Ong
et al evaluated pulmonary function tests in malnourished children from West
Bengal, India. They identified equations that can be used to estimate target
values based on sitting height and weight. The authors are from the University
of Dundee.
Patient
selection: malnourished children from 3 to 17 years (page 18)
Parameters:
(1)
sitting height in cm
(2)
body weight in kilograms
Predicted
pulmonary function tests:
(1)
FEV1 (forced expiratory volume in 1 second) in liters
(2)
FVC (forced vital capacity) in liters
(3)
PEFR (peak expiratory flow rate) in liters per second
observed
pulmonary function test as percent of predicted =
=
(observed value) / (predicted) * 100%
For Boys
predicted
FEV1 in liters =
=
EXP(X)
X
=
=
(1.080 * (LN(sitting height))) + (0.657 * (LN(weight))) - 6.261
predicted
FVC in liters =
=
EXP(Y)
Y
=
=
(LN(sitting height)) + (0.669 * (LN(weight))) - 5.918
predicted
PEFR in liters per second =
=
EXP(Z)
Z
=
=
(0.781 * (LN(sitting height))) + (0.614 * (LN(weight))) + 0.378
For Girls
predicted
FEV1 in liters =
=
EXP(X)
X
=
=
(1.268 * (LN(sitting height))) + (0.518 * (LN(weight))) - 6.667
predicted
FVC in liters =
=
EXP(Y)
Y
=
=
(1.233 * (LN(sitting height))) + (0.527 * (LN(weight))) - 6.529
predicted
PEFR in liters per second =
=
EXP(Z)
Z
=
=
(1.545 * (LN(sitting height))) + (0.338 * (LN(weight))) - 2.093
NOTE:
While working on the spreadsheet it became apparent that the predicted PEFR by
these equations are significantly higher than expected and what seems
reasonable. Using -7.093 for girls gives a more reasonable value, suggesting a
typographical error. Alternatively the PEFR value does not need to be made
EXP.
|