Tab. 3.

Analysis of the correlation between the persistence of a fluid collection and its size following the determination of non-normality of distribution of the studied characteristics

Spearman’s rank correlation coefficient	n	r	tn − 2	p
Initial size of a fluid collection and its position relative to the kidney	99	0.16	1.568	0.120

The calculations took into account cases in which the numerical values of both studied characteristics were known. It was decided that the cases for which the fluid collection’s persistence was 0 days or was a distinct outlier were rejected.