Table 1 Characteristics of patients and X-ray images assigned to the training and test datasets
Training dataset | Test dataset | P value | |
|---|---|---|---|
Number of patients | 827 | 190 | |
Gender, n (%) | 0.132 | ||
Male | 537 (64.9) | 143 (75.3) | |
Female | 290 (35.1) | 47 (24.7) | |
Age, median (range), years | 58 (17–89) | 56 (14–87) | 0.038 |
Number of labeled lesions per image, n (%) | 0.486 | ||
One | 656 (79.4) | 144 (75.8) | |
Two | 112 (13.5) | 32 (16.8) | |
More than two | 59 (7.1) | 14 (7.4) | |
Location of urinary tract stone, n (%) | |||
Kidney | 428 (51.8) | 106 (55.8) | 0.895 |
Proximal ureter | 334 (40.4) | 72 (37.9) | 0.582 |
Mid-ureter | 75 (9.1) | 27 (14.2) | 0.046 |
Distal ureter | 184 (22.2) | 18 (9.5) | < 0.001 |
Staghorn calculus, n (%) | 0.553 | ||
Yes | 17 (2.1) | 2 (1.1) | |
No | 810 (97.9) | 188 (98.9) | |
Artificial foreign body in image, n (%) | 0.672 | ||
Yes | 53 (6.4) | 10 (5.3) | |
No | 774 (93.6) | 180 (94.7) |