Skip to main content

Table 5 Correlation analysis among traditional, eRIC, and fractional-order parameters, and the spirometric results

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

  FEV1 (L) FEV1 (%) FVC (L) FVC(%) FEV1/FVC FEF (L) FEF25–75 (%) FEF25–75/CVF
Resistive
 R0 − 0.33
ns 		− 0.35
< 0.05 		− 0.13
ns 		− 0.11
ns 		− 0.46
< 0.009 		− 0.29
ns 		− 0.44
< 0.02 		− 0.43
< 0.02
 Rm − 0.27
ns 		− 0.27
ns 		− 0.15
ns 		− 0.12
ns 		− 0.31
ns 		− 0.30
ns 		− 0.33
ns 		− 0.29
ns
 S 0.39
< 0.03 		0.45
< 0.02 		0.10
ns 		0.12
ns 		0.65
< 0.0001 		0.22
ns 		0.58
0.0005 		0.62
0.0001
 R4 − 0.30
ns 		− 0.31
ns 		− 0.12
ns 		− 0.08
ns 		− 0.43
< 0.02 		− 0.28
ns 		− 0.42
< 0.02 		− 0.40
< 0.03
 R12 − 0.29
ns 		− 0.29
ns 		− 0.16
ns 		− 0.14
ns 		− 0.32
ns 		− 0.31
ns 		− 0.35
< 0.05 		− 0.30
ns
 R20 − 0.17
ns 		− 0.13
ns 		− 0.16
ns 		− 0.10
ns 		− 0.07
ns 		− 0.31
ns 		− 0.05
ns 		− 0.43
< 0.02
 R4− R20 − 0.32
ns 		− 0.37
< 0.04 		− 0.01
ns 		− 0.01
ns 		− 0.66
< 0.0001 		− 0.09
ns 		− 0.55
< 0.002 		− 0.64
< 0.0001
Reactive
 Xm 0.47
< 0.007 		0.53
< 0.003 		0.22
ns 		0.24
ns 		0.65
< 0.0001 		0.24
ns 		0.60
0.0002 		0.62
0.0001
 Fr − 0.51
< 0.003 		− 0.56
0.0008 		− 0.25
ns 		− 0.32
ns 		− 0.63
0.0001 		− 0.34
ns 		− 0.66
< 0.0001 		− 0.65
< 0.0001
 Cdyn 0.31
ns 		0.33
ns 		0.25
ns 		0.24
ns 		0.24
ns 		0.21
ns 		0.35
ns 		0.26
ns
 Axt − 0.43
< 0.02 		− 0.49
< 0.005 		− 0.21
ns 		− 0.24
ns 		− 0.57
0.0006 		− 0.23
ns 		− 0.52
< 0.003 		− 0.52
< 0.003
 Axi − 0.44
< 0.02 		− 0.49
< 0.005 		− 0.20
ns 		− 0.22
ns 		− 0.61
0.0002 		− 0.23
ns 		− 0.54
< 0.002 		− 0.55
< 0.002
 Z4 − 0.36
< 0.05 		− 0.39
< 0.03 		− 0.18
ns 		− 0.16
ns 		− 0.47
< 0.008 		− 0.25
ns 		− 0.44
< 0.02 		− 0.42
< 0.02
eRIC
 R − 0.05
ns 		0.008
ns 		− 0.10
ns 		− 0.02
ns 		0.11
ns 		− 0.26
ns 		− 0.01
ns 		0.08
ns
 Rp − 0.37
< 0.04 		− 0.41
< 0.02 		− 0.10
ns 		− 0.09
ns 		− 0.62
0.0001 		− 0.17
ns 		− 0.53
< 0.002 		− 0.59
0.0001
 Rt − 0.31
ns 		− 0.31
ns 		− 0.14
ns 		− 0.09
ns 		− 0.41
< 0.03 		− 0.28
ns 		− 0.42
< 0.02 		− 0.40
< 0.03
 I 0.37
< 0.05 		0.42
< 0.02 		0.14
ns 		0.21
ns 		0.54
< 0.002 		0.14
ns 		0.48
< 0.006 		0.53
< 0.002
 C 0.24
ns 		0.30
ns 		0.13
ns 		0.17
ns 		0.28
ns 		0.14
ns 		0.37
< 0.04 		0.33
ns
FrOr
 G − 0.38
< 0.0026 		− 0.35
0.0058 		− 0.30
< 0.02 		− 0.32
< 0.02 		− 0.14 
ns 		− 0.33
< 0.009 		− 0.28
< 0.026 		− 0.12
ns
 H 0.12
ns 		0.07
ns 		− 0.11
ns 		0.00
ns 		0.16
ns 		013
ns 		0.15 
ns 		0.15
ns
 η − 0.40
< 0.002 		− 0.28
< 0.03 		− 0.32
< 0.02 		− 0.19 
ns 		− 0.36
< 0.004 		− 0.31
< 0.02 		− 0.34
< 0.007 		− 0.33
< 0.009
  1. Significance was analyzed after Bonferroni correction. The significant associations are described in italic
  2. FEV1: forced expiratory volume in the first second; FVC: forced vital capacity; FEF: forced expiratory flow between 25 and 75% of the FVC; %: percentage of the predicted values; 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; eRIC: extended resistance–inertance–compliance model; FrOr: fractional order; R: central airway resistance; Rp: peripheral resistance; Rt: total resistance; I: pulmonary inertance; C: alveolar compliance; G: damping factor; H: elastance; η: hysteresivity coefficient
Back to article page

BioMedical Engineering OnLine

ISSN: 1475-925X

Contact us