Table 5A.

Prediction of all-cause mortality by respiratory parameters – all patients

Respiratory parameter	Cox model of proportional risk
	HR (95% CI)	p-value
PaO2 (kPa)
Continuously*	1.304 (1.108–1.534)	0.001
<7.3	3.064 (1.840–5.103)	<0.001
<8.0	1.700 (1.040–2.779)	0.034
PaCO2 (kPa)
Continuously**	1.484 (1.177–1.870)	0.001
5.0–7.0	Reference category
<5.0	0.805 (0.482–1.345)	0.407
>7.0	1.813 (0.648–5.071)	0.257
Desaturation
Yes	1.883 (1.217–2.911)	0.004

Notes:

^*HR represents change of risk of mortality, if parameter decreases by unit (lower values are risk).

^**HR represents change of risk of mortality, if parameter increases by unit (higher values are risk). Desaturation, greatest decrease of SpO₂ during 6-MWT (%)>4% and/or minimal SpO₂ during (after) 6-MWT (%)<90%. p-values in bold represent significant change of mortality risk (expressed as hazard ratio).

Abbreviations: 6-MWT, 6-minute walking test; HR, hazard ratio; PaCO₂, partial pressure of arterial carbon dioxide; PaO₂, partial pressure of arterial oxygen; SpO₂, peripheral capillary oxygen saturation.