Prognostic value of functional CT imaging in COVID-ARDS: a two-centre prospective observational study

Respiratory Research

Table 3 Definition and median value of image-derived variables included in the Cox proportional hazards regression model

Variable	Definition	Unit	All Subjects	Non survivors	Survivors	p-value
V_rec	Global recruited lung tissue volume 5 → 15 cmH₂O	L	0.11 [0.07–0.19]	0.14 [0.09–0.23]	0.09 [0.07–0.15]	0.028
sΔV z	Specific volume change, centre of mass z relative distance from grid origin	%	15 [8, 23]	10 [6, 22]	17 [10, 24]	0.050
sΔV x	Specific volume change, centre of mass x relative distance from grid origin	%	-3 [-11, 3]	-5 [-15, 0]	-1 [-7, 4]	0.10

Data are median [1st quartile – 3rd quartile]. See online supplement (Supplemental Tables 1 & 2) for detailed computation of each image-based variable; p.-value compare survivors to non-survivors

ISSN: 1465-993X