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Computerization of spirometric measurements and prediction of the normal values have led to prove whether the prediction formulas programed in the computer would be applicable to the Koreans. In this context, 23 male and 32 female college students who were not smoking were subjected who were not smoking were subjected to measure 13 parameters of pulmonary ventilation, and the prediction formulas for these parameters on age and physical characteristics-height, weight and body surface area were derived. Comparing the predicted values with the measured values and with those derived by other domestic and foreign researchers, the following results were obtained. 1. Means and standard deviations of ventilatory volumes, forced expiratory flow rates, and rations of timed forced expiratory volume to forced vital capacity were shown in Table 1. Variability of ventilatory volumes was a little bit smaller in males than in females, showing coefficient of variation ranging 11.7∼15.7% for the former and 13.4∼16.6% for the latter, Coeffeicients of variation of forced expiratory flow rates ranged 17.2∼26.1% in males and 15.9∼25.5% in females, indicating larger variability than that of ventilatory volumes in both sexes. 2. All the physical measurements-height, weight and body surface area showed significant correlations with ventilatory volumes, but not with forced expiratory flow rates and with ratios of timed forced expiratory volume to forced vital capacity. Age, though it was very limited in range in both sexes, showed significant correlation only with forced vital capacity and forced expiratory volume in 3 seconds in females, but not with all others(Table 2). 3. Simple and multiple linear regression equations predicting various parameters of pulmonary ventilation with physical measurements and age with which pulmonary ventilatory parameters showed significant correlations have been derived and shown in Table 3. It was proved that these prediction equations were very valid, because all the predicted values were well coincided with the respective mesured values. 4. Prediction equations obtained in this study were compared with those reported by other domestic and foreign researchers(Table 4). Those derived by domestic researchers were proved to be valid when applied to the measured values in this study. On the other hand, some of those derived by foreign researchers appeared not valid for the Korea college students; even the prediction equations that were valid were considered necessary to add a constant to add a constant(correction factor), difference between the predicted and the measured means, to make them agree for practical purposes.
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