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

Table 2 Rates of ordinal and continuous symptoms, healthcare utilisation and pulmonary function test results

Variable	Median	Interquartile range
Dyspnoea	2	2–3
ED presentations per year	0	0–0.6
Inpatient admission days per year	0	0–3.8
FEV1 as percentage of predicted	70%	52–93%
FVC as percentage of predicted	78%	62–98%
TLC as percentage of predicted	93%	75–107%
DLCO as percentage of predicted	68%	55–83%

Legend: Dyspnoea was an ordinal variable with a scale of increasing severity from 1 to 4 (World Health Organisation functional class). ED emergency department, FEV1 forced expiratory volume in 1 second, FVC forced vital capacity, TLC total lung capacity, DLCO diffusing capacity of carbon monoxide corrected for haemoglobin

ISSN: 2398-2683