Role of variation coefficient of stone density in determining success of shock wave lithotripsy in urinary calculi

Table 1 Demographic features of patients and stones

Demographic parameter	Result
Age (years)	38.89 ± 14.61
Gender, n (%)
Male	294 (72.2)
Female	113 (27.8)
Stone volume	223.34 ± 77.01
SSD (cm)1	9.52 ± 2.47
Stone density (HUs)	900 (110-1570)
SHI (HUs)2	174.85 (17.7-583.9)
VCSD3	22 (3-83)
Stone laterality, n (%)
Left sided	213 (52.3)
Right sided	194 (47.7)
Location stone, n (%)
Renal	316 (77.64)
Ureter	91 (22.36)

¹Skin-stone distance.

²Stone heterogeneity index.

³Variation coefficient of stone density.

SSD: Skin-stone distance; HUs: Hounsfield units; VCSD: Variation coefficient of stone density.