Table 1.
Demographic characteristics and baseline data of two groups
| NTFS-UAS group | T-UAS group | t/χ2 | P value | |
|---|---|---|---|---|
| Total number, (n) | 102 | 112 | ||
| Age (years), mean ± SD | 47.69 ± 9.18 | 46.75 ± 11.87 | 0.648 | 0.517 |
| Gender, n (%) | 1.978 | 0.160 | ||
| Male | 55 (53.9%) | 71 (63.4%) | ||
| Female | 47 (46.1%) | 41 (36.6%) | ||
| BMI (kg/m2), mean ± SD | 24.25 ± 2.97 | 23.54 ± 3.37 | 1.645 | 0.101 |
| ASA score, n (%) | 0.987 | 0.667 | ||
| I | 12 (11.8%) | 9 (8.0%) | ||
| II | 88 (86.3%) | 101 (90.2%) | ||
| III | 2 (1.9%) | 2 (1.8%) | ||
| Comorbidities, n (%) | 1.841 | 0.616 | ||
| Hypertension | 18 (17.6%) | 19 (17.0%) | ||
| Diabetes mellitus | 8 (7.8%) | 5 (4.5%) | ||
| Renal insufficiency | 10 (9.8%) | 8 (7.1%) | ||
| Operative side, n (%) | 0.956 | 0.328 | ||
| Left | 46 (45.1%) | 58 (51.8%) | ||
| Right | 56 (54.9%) | 54 (48.2%) | ||
| History of surgery on ipsilateral side, n (%) | 1.256 | 0.764 | ||
| RIRS | 9 (8.8%) | 13 (11.6%) | ||
| PCNL | 8 (7.8%) | 12 (10.7%) | ||
| Open surgery | 3 (2.9%) | 4 (3.6%) | ||
| Midstream urine culture, n (%) | 1.843 | 0.175 | ||
| Positive | 26 (25.5%) | 20 (17.9%) | ||
| Negative | 76 (74.5%) | 92 (82.1%) | ||
| Renal stone size (range); mm, mean ± SD | 18.47 ± 4.67 | 18.20 ± 4.46 | 0.440 | 0.661 |
| Renal stone hardness (HU), mean ± SD | 1061.67 ± 272.54 | 1096.38 ± 240.94 | 0.989 | 0.324 |
| Stone location, n (%) | 0.417 | 0.981 | ||
| Pelvis | 41 (40.2%) | 43 (38.4%) | ||
| Upper calyx | 10 (9.8%) | 9 (8.0%) | ||
| Middle calyx | 9 (8.8%) | 11 (9.8%) | ||
| Lower calyx | 12 (11.8%) | 15 (13.4%) | ||
| Multiple calyxes | 30 (29.4%) | 34 (30.4%) | ||
| Hydronephrosis, n (%) | 3.530 | 0.314 | ||
| No | 27 (26.5%) | 24 (21.4%) | ||
| Mild | 47 (46.1%) | 57 (50.9%) | ||
| Moderate | 22 (21.6%) | 29 (25.9%) | ||
| Gross | 6 (5.9%) | 2 (1.8%) | ||
| Preoperative ureteral stent placement, n (%) | 0.213 | 0.644 | ||
| Yes | 46 (45.1%) | 47 (42.0%) | ||
| No | 56 (54.9%) | 65 (58.0%) | ||
NTFS-UAS novel tip-flexible suctioning ureteral access sheath, T-UAS traditional ureteral access sheath, SD standard deviation, BMI body mass index, ASA American Society of Anesthesiologists, RIRS retrograde intrarenal surgery, PCNL percutaneous nephrolithotomy, HU Hounsfield Unit