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A sample of 204 male and 224 female healthy Jordanian children was selected to determine the normal ventilatory functions of this Arab population. Forced vital capacity (FVC), one-second forced expiratory volume (FEV1), and forced mid-expiratory flow rate subject were recorded. The lung volumes measured were subsequently computed for body temperature and normal barometric pressure saturated (BTPS), the formulae quoted by Cotes being used.9For the analysis of the results the indices of lung function were expressed as logarithms and regressed on the logarithms of stature and also on the indices of age and weight. The 1% level of probability was accepted as significant. ResultsThe (table 4). FEV,% has a poor correlation with all the other pulmonary function values as well as Table 1 Age and sex distribution ofchildren studied Age (v) No ofbovs No ofgirls

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