Table 5 Respiratory system reference equations obtained by the impulse oscillometry system for boys and girls
From: Reference equations for parameters of impulse oscillometry in Egyptian children and adolescents
IOS parameters | Equations | R2,% | Adjusted R2 | SEE |
|---|---|---|---|---|
Boys: | ||||
 Fres | = 26.742–(0.525 × age) | 25.2 | 24 | 3.928 |
 AX | = 6.778 – (0.037 × height) | 34 | 33 | 1.035 |
 R5 Hz | = 1.596 – (0.021 × age) – (0.005 × height) | 53.2 | 51.7 | 0.168 |
 R20 Hz | = 1.059–(0.010 × age) – (0.003 × height) | 41.4 | 39.5 | 0.126 |
 X5 Hz | = − 0.520 + (0.023 × age) | 39.9 | 39 | 0.122 |
 Z5 Hz | = 1.754 – (0.025 × age) – (0.005 × height) | 57.5 | 56.1 | 0.176 |
Girls: | ||||
 Fres | = 35.454 – (0.115 × height) | 13.9 | 12 | 5.731 |
 AX | = 7.517 – (0.041 × height) | 27.5 | 26 | 1.325 |
 R5 Hz | = 1.751 – (0.019 × age) – (0.006 × height) | 49.2 | 47 | 0.184 |
 R20 Hz | = 1.128 – (0.004 × height) | 21.8 | 20.1 | 0.169 |
 X5 Hz | = − 0.796 + (0.012 × age) + (0.003 × height) | 46.2 | 43.9 | 0.103 |
 Z5 Hz | = 1.928 – (0.022 × age) – (0.007 × height) | 52.1 | 50 | 0.195 |