Table 1.
Patients’ characteristics within the study groups
| Group A | Group B | Group C | ||||
|---|---|---|---|---|---|---|
| n | % | n | % | n | % | |
| Total | 44 | 100 | 34 | 100 | 84 | 100 |
| Stone radio-opacity | ||||||
| IR | 15 | 34.1 | 12 | 35.3 | 29 | 34.5 |
| MR | 17 | 38.6 | 10 | 29.4 | 33 | 39.3 |
| SR | 12 | 27.3 | 12 | 35.3 | 22 | 26.2 |
| Stent caliber (mm) | ||||||
| 8 | 12 | 27.3 | 8 | 23.5 | 14 | 16.7 |
| 7 | 10 | 22.7 | 3 | 8.8 | 10 | 11.9 |
| 6 | 22 | 50.0 | 23 | 67.6 | 60 | 71.4 |
| Body mass index (BMI) | ||||||
| OB (BMI >30) | 3 | 6.8 | 0 | 0 | 3 | 3.6 |
| OV (BMI 25–30) | 17 | 38.6 | 11 | 32.4 | 22 | 26.2 |
| N (BMI 18.5–25) | 24 | 54.5 | 23 | 67.6 | 59 | 70.2 |
| Stone size (mm) | ||||||
| <10 | 23 | 52.3 | 15 | 44.1 | 35 | 41.7 |
| 10–15 | 21 | 47.7 | 19 | 55.9 | 49 | 58.3 |
Group A stone-inside-loop, Group B loop-crossing-stone, Group C stone-outside-loop, IR intense radiopaque (similar or superior to 12th rib opacity), MR moderate radiopaque (less opaque than 12th rib), SR slightly radiopaque (barely visible), OB obese, OV over-weight, N normal weight