Table 3.
Characteristics of lower calyx stone patients in the primary and validation cohorts.
| Primary cohort | Validation cohort | |||||
|---|---|---|---|---|---|---|
| SF | Non-SF | p | SF | Non-SF | p | |
| Number of patients, n | 56 | 43 | 24 | 19 | ||
| Age, mean ± SD, years | 50.34 ± 10.82 | 48.40 ± 12.31 | 0.406a | 49.71 ± 12.94 | 49.89 ± 11.55 | 0.961a |
| Gender, n (%) | 0.350 | 0.553 | ||||
| Male | 34 (53.1%) | 30 (46.9%) | 11 (61.1%) | 7 (38.9%) | ||
| Female | 22 (62.9%) | 13 (37.1%) | 13 (52.0%) | 12 (48.0%) | ||
| BMI, mean ± SD, kg m−2 | 24.64 ± 3.75 | 23.15 ± 3.76 | 0.136a | 23.71 ± 3.24 | 24.12 ± 3.20 | 0.754a |
| Stone laterality, n (%) | 0.056 | 0.759 | ||||
| Left | 27 (48.2%) | 29 (51.8%) | 15 (57.7%) | 11 (42.3%) | ||
| Right | 29 (67.4%) | 14 (32.6%) | 9 (52.9%) | 8 (47.1%) | ||
| Hydronephrosis | <0.001 | <0.001 | ||||
| No/mild | 46 (78.0%) | 13 (22.0%) | 20 (83.3%) | 4 (16.7%) | ||
| Severe | 10 (25.0%) | 30 (75.0%) | 4 (21.1%) | 15 (78.9%) | ||
| Experience of operator, n (%) | <0.001 | 0.001 | ||||
| fURS ≥ 100 | 40 (78.4%) | 11 (21.6%) | 17 (81.0%) | 4 (19.0%) | ||
| fURS < 100 | 16 (33.3%) | 32 (66.7%) | 7 (31.8%) | 15 (68.2%) | ||
| Stone diameter (cm), n (%) | 0.007 | 0.012 | ||||
| ≤ 1 | 42 (66.7%) | 21 (33.3%) | 18 (72.0%) | 7 (28.0%) | ||
| >1 | 14 (38.9%) | 22 (61.1%) | 6 (33.3%) | 12 (66.7%) | ||
| Stone volume (cm3), n (%) | <0.001 | 0.002 | ||||
| ≤ 1 | 49 (71.0%) | 20 (29.0%) | 19 (76.0%) | 6 (24.0%) | ||
| >1 | 7 (23.3%) | 23 (76.7%) | 5 (27.8%) | 13 (72.2%) | ||
| Radiomics score, median (interquartile range) | 1.348 (0.467–2.243) | −0.462 (−1.429 to 0.260) | <0.001b | 0.557 (−0.175 to 2.009) | −0.895 (−1.482 to −0.119) | <0.001b |
SD, standard deviation; fURS, flexible ureteroscope; SF, stone free.
a
t-test.
b
rank sum test.
Others are chi-square test.