Table 2.

Multivariable analysis for change in SpO₂

	β unadjusted (95% CI)	p value	β adjusted (95% CI)	p value
Change atmospheric pressure	0.006 (0.004–0.008)	< 0.001	0.006 (0.005–0.008)	< 0.001
Age	0.002 (0.000–0.005)	0.1	0.002 (0.000–0.005)	0.09
Sex
Woman	Reference
Men	− 0.022 (− 0.078–0.035)	0.4	− 0.012 (− 0.071–0.047)	0.7
Smoking
No currently	Reference
Yes	0.083 (− 0.003–0.169)	0.06	0.067 (− 0.024–0.158)	0.2
Asthma
No	Reference
Yes	0.049 (− 0.040–0.139)	0.3	0.026 (− 0.072–0.124)	0.6
COPD
No	Reference
Yes	0.125 (− 0.015–0.264)	0.08	− 0.002 (− 0.126–0.158)	1.0
Heart attack
No	Reference
Yes	0.017 (− 0.113–0.147)	0.8	0.014 (− 0.125–0.153)	0.8
mMRC ≥ 2
No	Reference
Yes	0.211 (0.083–0.339)	0.001	0.183 (0.039–0.327)	0.01
Reduced lung function
No	Reference
Yes	0.084 (0.001–0.166)	0.05	0.049 (− 0.042–0.140)	0.3
Airway infection visit 2
No	Reference
Yes	− 0.013 (− 0.093–0.067)	0.7	− 0.030 (− 0.114–0.054)	0.5