Table S1.

Frequency of desaturation (n=552)

Desaturation	n=552
No	296 (53.6%)
Yes	256 (46.4%)

Note: Desaturation means greatest decrease of SpO₂ during 6-MWT (%) >4% and/or minimal SpO₂ during (after) 6-MWT (%)<90%.

Abbreviations: 6-MWT, 6-minute walking test; SpO₂, basal peripheral capillary oxygen saturation.