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Control (n = 31)
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Work-related asthma before BD (n = 31)
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Work-related asthma post BD (n = 31)
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Resistive parameters
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R0 (cmH2O/L/s)
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2.7 ± 0.7
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3.9 ± 1.8*
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2.8 ± 1.1‡‡‡
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Rm (cmH2O/L/s)
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2.6 ± 0.6
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3.3 ± 1.3
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2.5 ± 0.8‡‡‡
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S (cmH2O/L/s2)
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− 8.9 ± 18.7
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− 66.0 ± 65****
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− 32.7 ± 43.5‡‡‡
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R4 (cmH2O/L/s)
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2.6 ± 0.7
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3.6 ± 1.5*
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2.6 ± 0.9‡‡‡
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R12 (cmH2O/L/s)
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2.4 ± 0.6
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3.0 ± 1.1
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2.3 ± 0.8‡‡‡
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R20 (cmH2O/L/s)
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2.6 ± 0.7
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2.8 ± 1.1
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2.2 ± 0.8‡‡‡
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R4− R20 (cmH2O/L/s)
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0.03 ± 0.3
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0.7 ± 0.9****
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0.3 ± 0.5‡‡
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Reactive parameters
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Xm (cmH2O/L/s)
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0.4 ± 0.3
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− 0.4 ± 0.9****
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− 0.07 ± 0.6‡‡‡
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Fr (Hz)
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11.3 ± 1.5
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20.0 ± 6.6****
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17.2 ± 6.4‡
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Cdyn (mL/cmH2O)
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18.8 ± 6.3
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14.4 ± 5.8**
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19.4 ± 6.1‡‡‡
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Axt (cmH2O/L)
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8.7 ± 3.5
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31.4 ± 30.1****
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19.1 ± 22.0‡‡‡
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Axi (cmH2O/L)
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6.2 ± 2.6
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20.4 ± 20.4****
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11.9 ± 12.6‡‡‡
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Z4 (cmH2O/L/s)
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3.5 ± 0.9
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5.0 ± 2.3*
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3.6 ± 1.5‡‡‡
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- Data are mean ± SD
- 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
- *p < 0.05 related to control group
- **p < 0.01 related to control group
- ***p < 0.001 related to control group
- ****p < 0.0001 related to control group
- ‡p < 0.01 related to pre-BD
- ‡‡p < 0.001 related to pre-BD
- ‡‡‡p < 0.0001 related to pre-BD
