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Table 2 Correlation between dyspnea rating and other variables for O2 users and O2 non-users

From: Supplemental oxygen users with pulmonary fibrosis perceive greater dyspnea than oxygen non-users

  O2 (N = 812) No O2 (N = 514)
6MWD −0.28 −016
<0.0001 0.0003
BMI 0.15 0.14
<0.0001 0.002
HR baseline 0.07 0.03
0.04 0.53
HR at 6 min 0.08 0.16
0.02 0.0003
HR rise 0.02 0.15
0.49 0.0003
SpO2 baseline 0.03 −0.14
0.47 0.002
SpO2 at 6 min −0.19 −0.21
<0.0001 <0.0001
SpO2 drop −0.19 −0.17
<0.0001 <0.0001
  1. Values are correlation coefficient (top) and p value (bottom); BMI body mass index; 6MWD distance walked during six-minute walk test (6MWT); HR heart rate; SpO2 peripheral oxygen saturation; O2 completed 6MWT using supplemental oxygen; 6MWD distance walked during six-minute walk test (6MWT); O2 completed 6MWT using supplemental oxygen; No O2 completed 6MWT without using supplemental oxygen