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Table 3 Pearson’s correlation for resistance at 5 Hz, at 20 Hz, at 5 Hz, impedance at 5 Hz, resonant frequency, and reactance curve area below zero for boys and girls

From: Reference values of impulse oscillometry (IOS) for healthy Chinese children aged 4–17 years

IOS Parameters Age Height Weight
  r p r p r p
Boys
 R5, kPa/L/s − 0.671  < 0.001 − 0.689  < 0.001 − 0.572  < 0.001
 R20, kPa/L/s − 0.585  < 0.001 − 0.602  < 0.001 − 0.506  < 0.001
 X5, kPa/L/s 0.547  < 0.001 0.558  < 0.001 0.465  < 0.001
 Z5, kPa/L/s − 0.685  < 0.001 − 0.707  < 0.001 − 0.583  < 0.001
 Fres, Hz − 0.335  < 0.001 − 0.352  < 0.001 − 0.305  < 0.001
 R5–R20, kPa/L/s − 0.522  < 0.001 − 0.517  < 0.001 − 0.422  < 0.001
Girls
 R5, kPa/L/s − 0.637  < 0.001 − 0.664  < 0.001 − 0.591  < 0.001
 R20, kPa/L/s − 0.536  < 0.001 − 0.552  < 0.001 − 0.508  < 0.001
 X5, kPa/L/s 0.516  < 0.001 0.533  < 0.001 0.492  < 0.001
 Z5, kPa/L/s − 0.654  < 0.001 − 0.684  < 0.001 − 0.609  < 0.001
 Fres, Hz − 0.397  < 0.001 − 0.430  < 0.001 − 0.376  < 0.001
 R5–R20, kPa/L/s − 0.505  < 0.001 − 0.511  < 0.001 − 0.419  < 0.001
  1. R5 = resistance at 5 Hz, R20 = resistance at 20 Hz, X5 = reactance at 5 Hz, Fres = resonant frequency, Z5 = impedance at 5 Hz, R5–R20 = fall in resistance between R5 and R20