Table 1. Descriptive statistics of tested variables—Serum VEGF-A in the study and comparative group.

	N	Mean	Median value	Minimum	Maximum	Standard deviation	Coefficient of variation
Serum VEGF-A before surgery [pg/ml]–group b	48	53.30	41.70	10.39	150.57	33.49	62.85
Serum VEGF-A after surgery [pg/ml]—group b	48	61.46	48.64	9.03	215.31	40.24	65.46
Serum VEGF-A [pg/ml]–group p	50	32.13	22.56	0.00	130.77	34.57	107.59

group b, study group; group p, comparative group.