The Normal Peak Expiratory Flow Rate
    Although there may be a chart which indicates the normal PEFR according to age,
    sex, and height, it is often necessary to quickly recall the predicted normal value
    for a particular child at the bed side ...
    The average Peak Expiratory Flow Rate (Lit/min) =
    Height (Cm) x 5 - 400
    We can make it even simpler if we remember that at height 110 Cm, the PEFR is
    150 lit/min then we just simply add 50 lit/min for each 10 centimeters
    above 110.
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