Obstructive sleep apnoea is associated with dynamic intra-thoracic central airway collapse: results of a 10-year multi-centre retrospective analysis

Table 3 Unadjusted linear regression models assessing associations between intra-thoracic central airway collapse and obstructive sleep apnoea

OSA index	Expected change in OSA index with a 10% increase in dynamic intra-thoracic central airway collapse	95% confidence interval	P value
AHI	9.1 events/hour	4.1 to 14.1 events/hour	0.0004
Supine AHI	9.5 events/hour	1.4 to 17.5 events/hour	0.0211
AHI in REM sleep	0.7 events/hour	−4.3 to 5.7 events/hour	0.7736
RDI	9.2 events/hour	4.0 to 14.3 events/hour	0.0006
ODI	15.0 events/hour	8.5 to 21.6 events/hour	< 0.0001
Average SpO2 in supine sleep	−1.8%	−0.8 to −2.8%	0.0006
Average SpO2 in non-supine sleep	−1.3%	−0.4 to − 2.2%	0.0055

Legend: Associations are described by the expected change in the obstructive sleep apnoea index given a 10% increase in dynamic intra-thoracic central airway collapse. OSA obstructive sleep apnoea, AHI apnoea hypopnoea index, REM rapid eye movement sleep, RDI respiratory disturbance index, ODI oxygen 3% desaturation index, SpO2 peripheral oxygen saturation

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