Table 1 Characteristics of the subepithelial lesions chosen for analysis.
Characteristic | Training set | Internal validation set | External validation set I | External validation set II | Multicenter test set |
|---|---|---|---|---|---|
Total patients (number) | 368 | 149 | 93 | 92 | 155 |
Age(year) | 52.25 ± 11.42 | 51.51 ± 11.07 | 53.42 ± 10.73 | 54.04 ± 10.74 | 55.32 ± 12.33 |
Sex (male/female) | 175:193 | 65:84 | 37:56 | 46:46 | 62:93 |
Total lesions (number) | 373 | 149 | 95 | 93 | 163 |
Total images (number) | 3718 | 1560 | 1754 | 904 | 1293 |
Tumor location (number) | |||||
Esophagus | 72(19.3%) | 19(12.75%) | 19(20.00%) | 6(6.45%) | 36(22.09%) |
Stomach | 208(55.76%) | 88(59.06%) | 48(50.53) | 53(56.99%) | 92(56.44%) |
Duodenum | 6(1.61%) | 0 | 1(1.05%) | 1(1.08%) | 2(1.22%) |
Colon | 13(3.49%) | 5(3.36%) | 0 | 2(2.15%) | 5(3.07%) |
Rectum | 74(19.84%) | 37(24.83%) | 27(28.42%) | 31(33.33%) | 28(17.18%) |
Lesion types (number) | |||||
GISTs | 113(30.29%) | 39(26.17%) | 30(31.58%) | 32(34.41%) | 52(31.90%) |
Non-GISTs | 260(69.71%) | 110(73.83%) | 65(68.42%) | 61(65.59%) | 111(68.10%) |
Lesion size (mm) | |||||
<20 | 316(84.72%) | 127(85.23%) | 79(83.16%) | 88(94.62%) | 148(90.80%) |
≥ 20 | 57(15.28%) | 22(14.77%) | 16(16.84%) | 5(5.38%) | 15(9.20%) |
Originating layer(number) | |||||
Deep mucosa | 31(8.31%) | 6(4.03%) | 6(6.32%) | 18(19.35%) | 8(4.91%) |
Muscularis mucosa | 57(15.28%) | 20(13.42%) | 34(35.79%) | 4(4.30%) | 35(21.47%) |
Submucosa | 101(27.08%) | 53(35.57%) | 25(26.32%) | 20(21.51%) | 34(20.86%) |
Muscularis propria | 184(49.33%) | 70(46.98%) | 30(31.58%) | 51(16.13%) | 86(52.76%) |
Echogenicity | |||||
Echoless | 2(0.54%) | 0 | 0 | 0 | 0 |
Hypo-echoic | 338(90.62%) | 129(86.58%) | 80(84.21%) | 92(98.92%) | 158(96.93%) |
Iso-echoic | 2(0.54%) | 6(4.03%) | 1(1.05%) | 0 | 5(3.07%) |
Hyper-echoic | 31(8.31%) | 14(9.40%) | 14(14.74%) | 1(1.08%) | 0 |
Echo heterogeneity(number) | |||||
Homogeneous | 255(68.36%) | 87(58.39%) | 74(77.89%) | 81(87.10%) | 126(77.30%) |
In-homogeneous | 74(19.84%) | 39(26.17%) | 21(22.11%) | 12(12.90%) | 37(22.70%) |
Not described | 44(11.80%) | 23(15.44%) | 0 | 0 | 0 |
