Table 1. Characteristics of the patients and lesions in a study of the safety and short-term outcomes of endoscopic submucosal dissection for early gastric cancer in elderly patients.
| Elderly group | Non-elderly group | P value | |
| Patient characteristics | |||
| Patients, n | 345 | 547 | |
| Age, mean ± SD, y | 80 ± 4 | 65 ± 7 | |
| Sex, n (%) | < 0.01 | ||
| Male | 238 (69.0) | 441 (80.6) | |
| Female | 107 (31.0) | 106 (19.3) | |
| Co-morbidities, n (%) | |||
| Hypertension | 165 (47.8) | 186 (34.0) | < 0.01 |
| Diabetes mellitus | 67 (19.4) | 78 (14.3) | 0.04 |
| Heart disease | 41 (11.9) | 25 (4.6) | < 0.01 |
| Cerebrovascular disease | 43 (12.5) | 21 (3.8) | < 0.01 |
| Chronic renal failure | 26 (7.5) | 29 (5.3) | 0.18 |
| Liver cirrhosis | 8 (2.3) | 14 (2.6) | 0.82 |
| COPD | 66 (19.1) | 60 (11.0) | < 0.01 |
| Dementia | 26 (7.5) | 7 (1.3) | < 0.01 |
| Condition of stomach | 0.87 | ||
| Normal stomach | 337 (97.7) | 536 (98.0) | |
| Remnant stomach | 6 (1.7) | 6 (1.1) | |
| Gastric tube | 2 (0.6) | 5 (0.9) | |
| Use of anticoagulant and/or antiplatelet drugs, n (%) | 87 (25.2) | 65 (11.9) | < 0.01 |
| Lesion characteristics | |||
| Lesions, n | 421 | 641 | |
| Location, n (%) | 0.59 | ||
| Upper | 77 (18.3) | 102 (15.9) | |
| Middle | 210 (49.9) | 332 (51.8) | |
| Lower | 134 (31.8) | 207 (32.3) | |
| Mean tumor size, mm | 17.5 ± 14.0 | 16.6 ± 12.1 | 0.14 |
| Histologic type | 0.16 | ||
| Differentiated | 408 (96.9) | 610 (95.2) | |
| Undifferentiated | 13 (3.1) | 31 (4.8) | |
| Ulceration findings, n (%) | 0.58 | ||
| Present | 56 (13.3) | 93 (14.5) | |
| Absent | 365 (86.7) | 548 (85.5) | |
| Depth, n (%) | 0.19 | ||
| Intramucosal | 386 (91.7) | 572 (89.2) | |
| Deeper than intramucosal | 35 (8.3) | 69 (10.8) | |
SD, standard deviation; COPD, chronic obstructive pulmonary disease.