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Table 1 Baseline characteristics in single and multiple groups

From: Increased incidence of metachronous gastric neoplasm after endoscopic resection in patients with synchronous gastric neoplasm

  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     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     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     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     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
  1. a68 patients were not examined
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