Tab. 2.

Verification of the normality of the studied characteristics’ distribution: of the initial size and persistence of a fluid collection

Shapiro–Wilk normality test	n	W	p
Initial size of the fluid collection	99	0.92	<0.001
Persistence of the fluid collection	105	0.58	<0.001

The initial size of the fluid collection should be understood as its largest dimension upon detection (mm). The persistence of the fluid collection should be understood as the time range (the number of days) from detection to the last scan in which a given fluid collection was observed.