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. 2019 Nov 20;7(1):1692645. doi: 10.1080/20018525.2019.1692645

Table 3.

Results from univariate regression analyses of individual values from each parameter versus measured Wmax in study A-D and the pilot study

Variable* Study A
 Study B
 Study C
 Study D
 Pilot study, standard test**
 Pilot study, new test***
  R2 R2 R2 R2 R2 R2
FEV1 0.41 0.32 0.30 0.28 0.44 0.67
DLCO 0.37 nd nd 0.21 0.78 0.75
VA 0.26 nd nd nd 0.10 0.23
FEF50 0.25 nd nd nd 0.43 0.49
FVC 0.20 0.22 0.24 0.26 0.06 0.20
SVC 0.16 0.20 0.27 0.26 0.04 0.17
FEF25-75 0.15 nd nd nd 0.53 0.63
Weight 0.14 0.16 0.23 0.11 0.25 0.32
Height 0.13 0.21 0.12 0.21 0.29 0.29
Age 0.07 0.07 0.02 0.05 0.16 0.15
TLC 0.03 nd 0.0005 0.13 0.02 0.05
RAW 0.03 nd nd 0.05 nd nd
SGAW 0.03 nd nd nd nd nd
TGV 0.004 0.002 nd 0.006 0.03 0.05
RV 0.002 nd 0.10 0.008 0.004 0.02
IC nd nd 0.23 0.31 0.29 0.36
FRC nd nd 0.06 0.002 nd nd
VC nd nd 0.23 nd 0.04 0.17

*Sorted by rank order no in Study A

** Value vs measured WMAX in standard maximum test

*** Value vs measured WMAX in new maximum test

DLCO, diffusing capacity for carbon monoxide; FEF25-75, mid-expiratory flow; FEF50, forced expiratory flow – 50%; FEV1, forced expiratory volume in 1 sec; FRC, functional residual capacity; FVC, forced vital capacity; IC, inspiratory capacity; Nd, not determined: RAW, airway resistance; RV, residual volume; SGAW, specific airway conductance; SVC, slow vital capacity; TGV, thoracic gas volume; TLC, total lung capacity; VA, alveolar volume; VC, vital capacity.