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Table 6 Association among traditional, eRIC and fractional-order parameters and plethysmographic analysis

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

 

VC (L)

IC (L)

ERV (L)

TV (L)

RV/TLC

FRC (L)

RV (L)

TLC (L)

TGV (L)

Raw

SGaw

Resistive

 R0

− 0.36

< 0.05

− 0.41

< 0.03

− 0.09

ns

− 0.34

ns

0.05

ns

− 0.20

ns

0.03

ns

− 0.31

ns

− 0.20

ns

0.35

ns

− 0.30

ns

 Rm

− 0.39

< 0.03

− 0.41

< 0.02

− 0.14

ns

− 0.34

ns

0.02

ns

− 0.25

ns

− 0.20

ns

− 0.37

< 0.04

− 0.23

ns

0.21

ns

− 0.17

ns

 S

0.22

ns

0.30

Ns

− 0.0005

ns

0.25

ns

− 0.09

ns

0.06

ns

− 0.004

ns

0.09

ns

0.09

ns

− 0.57

0.0007

0.51

< 0.003

 R4

− 0.37

< 0.04

− 0.43

< 0.02

− 0.08

ns

− 0.34

ns

0.06

ns

− 0.19

ns

− 0.15

ns

− 0.32

ns

− 0.18

ns

0.28

ns

− 0.28

ns

 R12

− 0.39

< 0.03

− 0.41

< 0.02

− 0.12

ns

− 0.32

ns

0.01

ns

− 0.25

ns

− 0.19

ns

− 0.37

ns

− 0.23

ns

0.21

ns

− 0.20

ns

 R20

− 0.43

< 0.02

− 0.42

< 0.02

− 0.18

ns

− 0.34

ns

0.008

ns

− 0.28

ns

− 0.24

ns

− 0.44

< 0.02

− 0.24

ns

− 0.02

ns

0.03

ns

 R4 − R20

− 0.11

ns

− 0.23

ns

0.08

ns

− 0.16

ns

0.1

ns

0.02

ns

0.03

ns

− 0.008

ns

− 0.01

ns

0.52

< 0.003

− 0.54

< 0.002

Reactive

 Xm

0.26

ns

0.29

ns

0.03

ns

0.22

ns

− 0.13

ns

0.006

ns

− 0.01

ns

0.09

ns

0.02

ns

− 0.58

0.0005

0.49

< 0.006

 Fr

− 0.38

< 0.04

− 0.39

< 0.03

− 0.06

ns

− 0.30

ns

0.30

ns

0.18

ns

0.10

ns

− 0.04

ns

0.13

ns

0.40

< 0.03

− 0.38

< 0.04

 Cdyn

0.40

< 0.03

0.38

< 0.04

0.22

ns

0.30

ns

0.08

ns

0.37

< 0.05

0.20

ns

0.36

< 0.05

0.36

< 0.05

− 0.30

ns

0.24

ns

 Axt

− 0.25

ns

− 0.28

ns

− 0.07

ns

− 0.24

ns

0.07

ns

− 0.09

ns

− 0.04

ns

− 0.15

ns

− 0.09

ns

0.56

0.0008

− 0.41

< 0.03

 Axi

− 0.22

ns

− 0.27

ns

− 0.05

ns

− 0.23

ns

0.05

ns

− 0.09

ns

− 0.04

ns

− 0.13

ns

− 0.09

ns

0.59

0.0004

− 0.46

< 0.008

 Z4

− 0.32

ns

− 0.36

< 0.05

− 0.11

ns

− 0.30

ns

0.02

ns

− 0.21

ns

− 0.13

ns

− 0.27

ns

− 0.20

ns

0.44

< 0.02

− 0.33

< 0.07

eRIC

 R

− 0.37

< 0.04

− 0.35

ns

− 0.20

ns

− 0.30

ns

− 0.05

ns

− 0.32

ns

− 0.30

ns

− 0.46

< 0.008

− 0.28

ns

− 0.20

ns

0.16

ns

 Rp

− 0.21

ns

− 0.33

ns

0.09

ns

− 0.23

ns

0.10

ns

− 0.01

ns

− 0.009

ns

− 0.09

ns

− 0.03

ns

0.50

< 0.004

− 0.48

< 0.007

 Rt

− 0.38

< 0.04

− 0.46

< 0.01

− 0.04

ns

− 0.35

< 0.05

0.04

ns

− 0.19

ns

− 0.18

ns

− 0.34

ns

− 0.18

ns

0.27

ns

− 0.27

ns

 I

0.10

ns

0.09

ns

− 0.01

ns

0.06

ns

− 0.25

ns

− 0.27

ns

− 0.14

ns

− 0.13

ns

− 0.25

ns

− 0.41

< 0.02

0.35

< 0.05

 C

0.30

ns

0.32

ns

0.19

< 0.04

0.21

ns

0.13

ns

0.39

< 0.03

0.20

ns

0.32

ns

0.45

< 0.02

− 0.41

< 0.03

0.37

< 0.04

FrOr

 G

− 0.15

ns

− 0.16

ns

− 0.16

ns

− 0.20

ns

− 0.15

ns

− 0.34

ns

− 0.22

ns

− 0.25

ns

− 0.32

ns

0.53

< 0.003

− 0.31

ns

 H

− 0.31

ns

− 0.31

ns

− 0.14

ns

− 0.27

ns

0.07

ns

− 0.16

ns

− 0.07

ns

− 0.25

ns

− 0.13

ns

0.36

< 0.05

− 0.16

ns

 η

0.13

ns

0.15

ns

− 0.16

ns

− 0.05

ns

− 0.19

ns

− 0.16

ns

− 0.08

ns

0.03

ns

− 0.24

ns

0.53

< 0.003

− 0.34

ns

  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