Table 1 Baseline characteristics in single and multiple groups
|  | Total (N = 1569) | Single group (n = 1387) | Multiple group (n = 182) | P |
|---|---|---|---|---|
Age (mean ± SD) | 63.2 ± 9.3 | 63.2 ± 9.4 | 66.1 ± 8.0 | < 0.001 |
Male, n (%) | 1103 (70.3%) | 965 (69.6%) | 138 (75.8%) | 0.078 |
Cancer, n (%) | 678 (43.2%) | 598 (43.1%) | 80 (44.0%) | 0.829 |
Endoscopic atrophy | Â | Â | Â | 0.016 |
 Open type | 895 (57.0%) | 776 (56.0%) | 119 (65.4%) |  |
 Closed type | 674 (43.0%) | 611 (44.1%) | 63 (34.6%) |  |
Tumor location | Â | Â | Â | 0.545 |
 Upper, n (%) | 73 (4.7%) | 66 (4.7%) | 7 (3.9%) |  |
 Middle, n (%) | 491 (31.3%) | 428 (30.9%) | 63 (34.6%) |  |
 Lower, n (%) | 1005 (64.1%) | 893 (64.4%) | 112 (61.5%) |  |
Macroscopic type | Â | Â | Â | 0.384 |
 Depressed, n (%) | 222 (14.1%) | 204 (14.6%) | 18 (10.7%) |  |
Lesion diameter, mm (mean ± SD) | 14.5 ± 10.8 | 14.5 ± 11 | 15 ± 9.5 | 0.496 |
Depth of invasion | Â | Â | Â | 0.291 |
 Mucosa, n (%) | 1522 (9.1%) | 1343 (96.8%) | 179 (98.4%) |  |
 Submucosa, n (%) | 47 (3.0%) | 44 (3.2%) | 3 (1.7%) |  |
Helicobacter pylori infection, n (%)a | 793/1501 (52.8%) | 701/1323 (53.0%) | 92/178 (51.7%) | 0.714 |
 Persistent | 261 (36.3%) | 227 (17.2%) | 34 (19.1%) |  |
 Eradicated | 532 (68.4%) | 474 (35.8%) | 58 (32.6%) |  |
 Negative | 708 (95.3%) | 622 (47.0%) | 86 (48.3%) |  |
Follow-up, months (median, range) | 30 (12–161) | 30 (12–161) | 25 (12–112) | 0.261 |