Table 1.
Demographics and clinical outcomes.
| Values are median (IQR [range]) or number (%) | |
|---|---|
| No. treated cases | 459 |
| No. Male (%) | 300/459 (65.4) |
| Patient age (yrs) | 54.0 (44–66 [20–94]) |
| No. Left side (%) | 254/459 (55.3) |
| SSD; mm* | 106.2 (84.8–122.8 [36–184]) |
| No. stone location (%) | |
| Upper pole | 41/459 (8.9) |
| Midpole | 76/459 (16.6) |
| Lower pole | 161/459 (35.1) |
| Renal pelvis and PUJ | 60/459 (13.1) |
| Proximal ureter | 39/459 (8.5) |
| Mid ureter | 28/459 (6.1) |
| Distal ureter | 17/459 (3.7) |
| VUJ | 37/459 (8.1) |
| No. with ureteric stent present (%) | 32/459 (7.0) |
| Measures of stone burden: | |
| No. of stones | |
| 1 | 397/459 (86.5) |
| 2 | 40/459 (8.7) |
| 3 | 14/459 (3.1) |
| 4–6 | 8/459 (1.7) |
| Major axis length; mm* | 7.2 (5.6–9.6 [2.6–22.1]) |
| Minor axis length; mm* | 5.1 (4.0–6.6 [1.6–15.3]) |
| Vertical axis length; mm* | 7.1 (5.3–9.8 [0.2–29]) |
| Volume(s); mm3† | 137 (62–318 [6–2409]) |
| Total no. of pixels* | 69 (46–117 [12–533]) |
| CTTA variables: | |
| Mean HU* | 570 (430–700 [163–1217]) |
| Standard deviation of the HU* | 373 (267–453 [42–1069]) |
| MPP* | 572 (440–703 [163–1241]) |
| Entropy* | 4.2 (3.8–4.7 [2.5–5.8]) |
| Kurtosis* | −1.1 (−1.3–−0.8 [−1.6–1.86]) |
| Skewness* | 0.32 (0–0.53 [−1.14–1.3]) |
| No. SWL sessions | |
| 1 | 202/458 (44.1) |
| 2 | 134/458 (29.3) |
| 3 | 54/458 (11.8) |
| ≥4 | 69/458 (15) |
| No. follow-up imaging modality: | |
| X-ray | 289/459 (63) |
| US | 43/459 (9.4) |
| CT KUB | 127/459 (27.7) |
| No. days of follow-up after final SWL treatment | 124 (27–420 [0–1989]) |
| No. completely stone free (%) | 213/459 (46.4) |
| No. stone free with CIRFs | 282/459 (61.4) |
* Values were measured from the largest cross-sectional slice of the largest stone where more than one stone was treated. † Stone volume is the sum of individual stone volumes in cases with more than one stone. CIRFs, clinically insignificant residual fragments; CT KUB, computed tomography kidneys ureter bladder; CTTA, computed tomography texture analysis; HU, Hounsfield unit; PUJ, pelviureteric junction; MPP, mean of the positive pixels; SSD, skin-to-stone distance; SWL, extracorporeal shockwave lithotripsy; VUJ, vesicoureteric junction; US, ultrasound.