Table 3 Results of ROC curve analysis to differentiate the various calculi groups by using HU value, the grayscale value of calculi, and the grayscale value of posterior acoustic shadow
From: Predicting the chemical composition of urinary calculi in vivo using gray scale ultrasound
Calculi groups differentiated | ||||||
|---|---|---|---|---|---|---|
Uric acid anhydrous calculi vs. calcium-containing calculi (whewellite calculi, weddellite calculi , carbonate apatite calculi) | Weddellite calculi vs. Carbonate apatite calculi | Weddellite calculi vs. uric acid anhydrous calculi | Carbonate apatite calculi vs. uric acid anhydrous calculi | Whewellite calculi vs. uric acid anhydrous calculi | ||
HU value | AUC | 0.907 | 0.730 | 0.903 | 0.848 | 0.915 |
Cut-off value(HU) | 644.00 | 1063.00 | 644.00 | 644.00 | 644.00 | |
Sensitivity (%) | 88.00 | 85.71 | 95.24 | 91.67 | 88.00 | |
Specificity (%) | 95.04 | 66.67 | 88.00 | 88.00 | 95.43 | |
95% CI | 0.866−0939 | 0.577–0.851 | 0.779–0.970 | 0.717–0.935 | 0.870–0.948 | |
P-value | <0.001 | 0.004 | <0.001 | <0.001 | <0.001 | |
Grayscale value of calculi on ultrasound | AUC | 0.705 | - | 0.735 | 0.707 | 0.701 |
Cut-off value | 200.29 | - | 200.29 | 187.00 | 200.29 | |
Sensitivity (%) | 38.84 | - | 52.38 | 58.33 | 96.00 | |
Specificity (%) | 96.00 | - | 96.00 | 80.00 | 37.56 | |
95% CI | 0.646−0759 | 0.584–0.854 | 0.559–0.828 | 0.636–0.760 | ||
P-value | <0.001 | - | 0.003 | 0.007 | 0.001 | |
Grayscale value of posterior acoustic shadow on ultrasound | AUC | - | - | - | 0.699 | - |
Cut-off value | - | - | - | 31.48 | - | |
Sensitivity (%) | - | - | - | 58.33 | - | |
Specificity (%) | - | - | - | 84.00 | - | |
95% CI | 0.551–0.822 | |||||
P-value | - | - | - | 0.011 | - | |