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Table 3 Oscillometric characteristics of control individuals and patients with work-related asthma and the effect of bronchodilator use

From: Combined forced oscillation and fractional-order modeling in patients with work-related asthma: a case–control study analyzing respiratory biomechanics and diagnostic accuracy

  Control (n = 31) Work-related asthma before BD (n = 31) Work-related asthma post BD (n = 31)
Resistive parameters
 R0 (cmH2O/L/s) 2.7 ± 0.7 3.9 ± 1.8* 2.8 ± 1.1‡‡‡
 Rm (cmH2O/L/s) 2.6 ± 0.6 3.3 ± 1.3 2.5 ± 0.8‡‡‡
 S (cmH2O/L/s2) − 8.9 ± 18.7 − 66.0 ± 65**** − 32.7 ± 43.5‡‡‡
 R4 (cmH2O/L/s) 2.6 ± 0.7 3.6 ± 1.5* 2.6 ± 0.9‡‡‡
 R12 (cmH2O/L/s) 2.4 ± 0.6 3.0 ± 1.1 2.3 ± 0.8‡‡‡
 R20 (cmH2O/L/s) 2.6 ± 0.7 2.8 ± 1.1 2.2 ± 0.8‡‡‡
R4− R20 (cmH2O/L/s) 0.03 ± 0.3 0.7 ± 0.9**** 0.3 ± 0.5‡‡
Reactive parameters
 Xm (cmH2O/L/s) 0.4 ± 0.3 − 0.4 ± 0.9**** − 0.07 ± 0.6‡‡‡
 Fr (Hz) 11.3 ± 1.5 20.0 ± 6.6**** 17.2 ± 6.4
 Cdyn (mL/cmH2O) 18.8 ± 6.3 14.4 ± 5.8** 19.4 ± 6.1‡‡‡
 Axt (cmH2O/L) 8.7 ± 3.5 31.4 ± 30.1**** 19.1 ± 22.0‡‡‡
 Axi (cmH2O/L) 6.2 ± 2.6 20.4 ± 20.4**** 11.9 ± 12.6‡‡‡
 Z4 (cmH2O/L/s) 3.5 ± 0.9 5.0 ± 2.3* 3.6 ± 1.5‡‡‡
  1. Data are mean ± SD
  2. R0: intercept resistance; Rm: mean resistance; S: slope of the resistive values; R4: resistance in 4 Hz; R12: resistance in 12 Hz; R20: resistance in 20 Hz; Xm: mean reactance; Fr: resonance frequency; Cdyn: dynamic compliance; Axt: area under the reactance curve using the approximation by a triangle; Axi: area under the reactance curve using the integral based on the trapezoidal rule; Z4: impedance modulus in 4 Hz
  3. *p < 0.05 related to control group
  4. **p < 0.01 related to control group
  5. ***p < 0.001 related to control group
  6. ****p < 0.0001 related to control group
  7. p < 0.01 related to pre-BD
  8. ‡‡p < 0.001 related to pre-BD
  9. ‡‡‡p < 0.0001 related to pre-BD