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. 2014 Aug 11;14:136. doi: 10.1186/1471-2466-14-136

Table 3.

Relationship of 6-minute walk test outcomes to cardiopulmonary exercise test and demographics

 
 All cohort (n =47)
 IPF subgroup (n = 27)
 Non-IPF subgroup (n = 20)
  6MWD, meters 6MWT VO 2 peak, L.min −1 6MWT Nadir SpO 2 6MWD, meters 6MWT VO 2 peak, L.min −1 6MWT Nadir SpO 2 6MWD, meters 6MWT VO 2 peak, L.min −1 6MWT Nadir SpO 2
CPET VO2peak, L.min−1
 0.71**
 0.71**
 0.28
 0.74**
 0.79**
 0.24
 0.55*
 0.77**
 0.35
CPET VCO2peak, L.min−1
 0.77**
 0.74**
 0.19
 0.77**
 0.78**
 0.14
 0.69**
 0.80**
 0.35
CPET VEpeak, L.min−1
 0.36*
 0.21
 −0.03
 0.31
 0.24
 −0.37
 0.46*
 0.71**
 0.29
CPET Peak Work, Watts
 0.77**
 0.38*
 0.35*
 0.86**
 0.64**
 0.15
 0.73**
 0.62**
 0.48*
CPET NadirSpO2, %
 0.21
 0.13
 0.76**
 0.25
 0.29
 0.85**
 0.05
 0.03
 0.61**
Age, years
 −0.42**
 −0.14
 −0.23
 −0.42*
 −0.41*
 0.04
 −0.47*
 −0.09
 −0.35
Height, cm
 0.09
 −0.20
 0.10
 0.10
 0.06
 −0.15
 0.15
 0.51*
 0.35
FVC%pred
 0.22
 −0.12
 0.50**
 0.13
 0.04
 0.49*
 0.37
 0.04
 0.52*
TLCO%pred
 0.34*
 0.14
 0.60**
 0.28
 0.35
 0.64**
 0.39
 0.27
 0.47*
RVSP, mmHg −0.46* −0.33 −0.48 −0.49 −0.43 −0.47 −0.16 0.37 0.73

Data are Pearson’s r. *p <0.05, **p < 0.01 for relationship between variables. CPET = cardiopulmonary exercise test, VO2peak = peak oxygen uptake, 6MWT = six-minute walk test, 6MWD = six-minute walk distance, NadirSpO2 = lowest oxyhaemoglobin saturation, VO2 – oxygen uptake, VCO2 - carbon dioxide production, VE – ventilation, FVC – forced vital capacity, TLCO – diffusing capacity for carbon monoxide, RVSP – right ventricular systolic pressure on trans-thoracic echocardiogram.