Table 1 Baseline characteristics of the study population
Variables | Cohort | |
|---|---|---|
Derivation (n = 1146) | Validation (n = 142) | |
Gender, n (%) | ||
Male | 771 (67.3) | 104 (73.2) |
Female | 375 (32.7) | 38(26.8) |
Lesion numbers, n | 1247 | 149 |
Age, years, mean(range) | 66 (38–89) | 67 (47–82) |
Lesion location, n (%) | ||
Ut | 109 (8.7) | 6 (4.0) |
Mt | 804 (64.5) | 125 (83.9) |
Lt | 334 (26.8) | 18 (12.1) |
Lesion length, cm, (mean ± SD) | 2.4 ± 1.5 | 1.9 ± 1.3 |
> 2.0 cm, n (%) | 464 (37.2) | 40 (26.8) |
≤ 2.0 cm, n (%) | 783 (62.8) | 109 (73.2) |
Macroscopic type, n (%) | ||
0-IIb | 964 (77.3) | 116 (77.9) |
0-IIa/0-IIc | 50 (4.0) | 5 (3.4) |
Mixed type | 233 (18.7) | 28 (18.8) |
0-IIa + IIc | 28 (2.2) | 5 (3.4) |
0-IIb + IIc | 69 (5.5) | 7 (4.7) |
0-IIb + IIa | 82 (6.6) | 11 (7.4) |
0-IIa + IIb | 50 (4.0) | 3 (2.0) |
0-IIc + IIb | 4 (0.3) | 2 (1.3) |
Surface characteristic, n (%) | ||
White coating | 325 (26.1) | 46 (30.9) |
Spontaneous bleeding | 38 (3.0) | 1 (0.7) |
Granular change | 347(27.8) | 53(35.6) |
Nodularity | 79 (6.3) | 10(6.7) |
Circumferential extension, n (%) | ||
≤ 1/4 | 651 (52.2) | 110 (73.8) |
1/4–1/2 | 288 (23.1) | 12 (8.1) |
1/2–3/4 | 237 (19.0) | 21 (14.1) |
> 3/4 | 71 (5.7) | 6 (4.0) |
Depth of invasion, n (%) | ||
T1a-EP/T1a-LPM | 1010 (81.0) | 129 (86.6) |
T1a-MM/T1b-SM1 | 178 (14.3) | 16 (10.7) |
≥ T1b-SM2 | 59 (4.7) | 4 (2.7) |