Table 1. Frequency of studied risk factors in cases and their matched controls for gastric and esophageal cancers by anatomical and histological classification.
| PG I/II ratio | Smoking | H.pylori | Histological Subtype | |||
| <2.5 | (Ever) | Infection | Intestinal | Diffuse | Mixed | |
| Gastric non-cardia | ||||||
| Cases (n = 72) | 69.9% | 33 (45.8%) | 68 (94.4%) | 42 (58.3%) | 25 (34.7%) | 5 (6.9%) |
| Controls (n = 72) | 29.6% | 20 (27.8%) | 62 (86.1%) | n/a | n/a | n/a |
| Gastric cardia | ||||||
| Cases (n = 53) | 47.2% | 19 (35.8%) | 44 (83.0%) | 34 (64.1%) | 16 (30.2%) | 3 (5.7%) |
| Controls (n = 53) | 22.6% | 14 (26.4%) | 46 (86.8%) | n/a | n/a | n/a |
| Esophageal Adenocarcinoma | ||||||
| Cases (n = 36) | 11.1% | 19 (52.8%) | 23 (63.9%) | 31 (86.1%) | 2 (6.6%) | 3 (8.3%) |
| Controls (n = 36) | 27.8% | 9 (25.0%) | 31 (86.1%) | n/a | n/a | n/a |
| Esophageal squamous cell carcinoma | ||||||
| Cases (n = 59) | 49.2% | 27 (45.7%) | 56 (94.9%) | n/a | n/a | n/a |
| Controls (n = 59) | 23.7% | 16 (27.1%) | 53 (89.9%) | n/a | n/a | n/a |