IMPULSE OSCILLOMETRY REFERENCE VALUES FOR TURKISH CHILDREN AGED THREE TO EIGHT YEARS

<bold>Introduction:</bold> We aimed to determine the IOS reference values for Turkish children aged three to eight years. <bold>Methods:</bold> We enrolled subjects without chronic respiratory disease aged 3-8 years who present to the Department of Pediatrics for non-respiratory reasons in this cross-sectional study. All subjects had Impulse Oscillometric (IOS) measurements with the Jaeger Masterscreen-IOS device. Mean values of the three measurements for resistance (R) and reactance (X) at 5, 10, 15 and 20 Hz, the area under the curve of X (AX) and the resonant frequency (fres) were recorded. <bold>Results:</bold> Total of 245 children (111 boys) aged 3.06 to 8.53 years were enrolled. Linear regression analysis demonstrated that in girls, height was the sole determinant of R5, X10, X15 and AX while height and weight were determinants of R10, R15 and R20 together (Fig 1). In boys, height was the sole determinant of R5, R10, R15, R20, R5-20, X10, X15, X20 and AX (Fig 2). <bold>Conclusion:</bold> These results which provide the reference equations for normal Turkish children aged three to eight years will be valuable in evaluation of airway dynamics in health and disease states. <fig><object-id>erj;64/suppl_68/PA4934/F1</object-id><object-id>F1</object-id><object-id>F1</object-id><graphic></graphic></fig> <fig><object-id>erj;64/suppl_68/PA4934/F2</object-id><object-id>F2</object-id><object-id>F2</object-id><graphic></graphic></fig>