Table 1 Clinical data on total patients and patients with low and high stone heterogeneity indices.

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

 

Total patients

Low SHIa

High SHIa

P-Value

No. of patients

604

316

288

 

Sex (M:F)

394:210

204:112

190:98

0.780b

Mean Age (yrs)

51.92 ± 14.50

52.17 ± 14.92

51.65 ± 14.05

0.663c

Location (%)

   

0.103b

 Upper

492 (81.5)

250 (79.1)

242 (84.0)

–

 Mid

42 (7.0)

21 (6.6)

21 (7.3)

–

 Lower

70 (11.5)

45 (14.3)

25 (8.7)

–

Stone size (mm)

9.12 ± 3.89

9.04 ± 4.56

9.21 ± 3.00

0.567c

SSD (mm)

109.96 ± 19.31

110.10 ± 19.94

109.80 ± 18.63

0.850c

MSD (HU)

710.25 ± 269.65

612.23 ± 251.76

817.80 ± 247.02

<0.001c

SHI (HU)

229.45 ± 99.62

155.50 ± 51.95

310.58 ± 72.54

<0.001c

One-session success (%)

416 (68.9)

202 (63.9)

214 (74.3)

0.008b

One-session stone-free (%)

400 (66.2)

197 (62.3)

203 (70.5)

0.043b

  1. SSD: skin-to-stone distance, MSD: mean stone density, SHI: stone heterogeneity index.
  2. aLow and high SHI groups were divided using mean SHI (229.45).
  3. bPearson’s Chi-squared test with Yates’ continuity correction.
  4. cStudent’s or Welch’s two-sample t-test.
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