Retrograde endoscopic lithotripsy using the innovative nanosecond electropulse method

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Table 2 Distribution of stone size and location

Stone size (mm) and location	Kidney/UPJ (Group I n = 54)	Ureter (Group II, n = 799)				Bladder (Group III, n = 26)
		Upper/3 (n = 164)	Middle/3 (n = 67)	Lower/3 (n = 568)	Ureter total (n = 799)
Up to 5, n (%)	6 (11%)	87 (53%)**	46 (69%)***^⊕⊕	341 (60%)***^⊕	474 (59%)***^⊕	0 (0%)
5, to 10, n (%)	38 (70%)	56 (34%)	18 (27%)^⊕⊕	201 (35%)	275 (34%)	3 (12%)
10, to 15, n (%)	6 (11%)	15 (9%)	3 (4%)	26 (5%)*	44 (6%)	9 (35%)
15, n (%)	4 (8%)	6 (4%)***	0 (0%)**	0 (0%)***	6 (1%)***	14 (53%)

Note: * - p < 0.05; ** - p < 0.01; *** - p < 0.001 – Significant differences as compared to urinary bladder concrements; ⊕ - p < 0.05; ⊕⊕ - p < 0.01 – Significant differences as compared to UPJ concrements.