Table 4 Comparison of stone heterogeneity index (SHI) in one-session success and stone-free status according to mean stone density.

From: Stone heterogeneity index as the standard deviation of Hounsfield units: A novel predictor for shock-wave lithotripsy outcomes in ureter calculi

 

N (%)

SHI (HU)

P-value*

MSD ≥ 1000 HU (N = 100)

One-session success

Yes

38 (38.0)

308.02 ± 91.87

0.001

No

62 (62.0)

251.48 ± 54.51

 

One-session stone-free

Yes

36 (36.0)

299.45 ± 87.65

0.016

No

64 (64.0)

258.07 ± 64.30

 

MSD < 1000 HU (N = 504)

One-session success

Yes

378 (75.0)

232.69 ± 109.81

<0.001

No

126 (25.0)

185.19 ± 95.89

 

One-session stone-free

Yes

364 (72.2)

229.64 ± 106.64

0.001

No

140 (27.8)

197.85 ± 98.55

 
  1. MSD: mean stone density, SHI: stone heterogeneity index.
  2. *Student’s two-sample t-test for stone heterogeneity index in each group.
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