Table 2. Manometry values in individual radiographically defined groups of unexpandable lung severity. No+P-UL represents a combined group of No-UL plus P-UL.

Measurement	No-UL	P-UL	No+P-UL	S-UL	Significant difference
Initial pleural pressure (median & IQR) (cmH2O)	5.50 (0.00–+12.25)	4.00 (−2.00–+16.00)	5.00 (0.00–+13.00)	2.00 (−1.50–+8.50)	3 groups* P=0.288, 2 groups** P=0.267
Closing pleural pressure (median & IQR) (cmH2O)	0.00 (−12.5–+6.50)	−10.00 (−21.00–+9.00)	0.00 (−14.75–+6.75)	−15.0 (−27.00–−1.00)	3 groups* P=0.010, 2 groups** P=0.012
Terminal elastance (median & IQR) (cmH2O/L)	8.00 (4.76–11.79)	9.00 (6.25–15.22)	8.59 (5.54–12.12)	12.03 (7.42–34.5)	3 groups* P=0.022, 2 groups** P=0.021

*, comparison between groups No-UL, P-UL and S-UL; **, comparison between groups No+P-UL and S-UL. IQR, interquartile range.