This is a study of the ventilatory function (FEF2575, FEF50, PEF) by dry spirometer Vitalograph in 1,566 children of both sexes with ages ranging from 7 to 14 years; 1,156 children (73.6%) were selected as reference population. Height was the biometric parameter with the greatest correlation to the functional variables studied in both sexes, except to PEF in females. Significant differences were observed in functional variables between male and female subjects. Multiple and simple linear regression equations and percentiles tables for each sex are presented.