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Table 1 General characteristics of all urinary stone patients

From: Machine learning prediction of stone-free success in patients with urinary stone after treatment of shock wave lithotripsy

 

Kidney stone

Ureter stone

P-value

Patient characteristics

 Numbers of patients

167

191

 

 Age, mean ± SD

56.4 ± 13.9

60.4 ± 13.7

0.007

 Sex, numbers of men, %

90, 53.9

108, 56.5

0.615

 Diabetes mellitus, %

48, 28.7

57, 29.8

0.820

 Hypertension, %

65, 38.9

86, 45.0

0.243

 Psoas muscle cross-sectional area (mm2), mean ± SD

1105.9 ± 373.1

1067.4 ± 368.7

0.326

Stone characteristics

 Stone laterality, numbers on left side, %

87, 52.1

93, 48.7

0.520

 Stone length (mm, X-axis), mean ± SD

9.2 ± 3.5

6.6 ± 1.5

< 0.001

 Stone length (mm, Y-axis), mean ± SD

9.3 ± 3.2

7.4 ± 1.7

< 0.001

 Stone length (mm, Z-axis), mean ± SD

9.7 ± 3.1

9.4 ± 2.8

0.345

 Stone volume (mm3), mean ± SD

516.8 ± 479.6

268.2 ± 182.2

< 0.001

 Skin to stone distance 90o (mm), mean ± SD

87.9 ± 14.8

108.9 ± 16.3

< 0.001

 Mean stone density, mean ± SD

834.3 ± 296.9

766.6 ± 274.7

0.025

 Stone heterogeneity index, mean ± SD

178.0 ± 83.9

174.2 ± 84.9

0.669

  1. SD standard deviation