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Helicobacter pylori positivity according to age n (%)
| Age (yr) | Korean Females | Female Vietnamese immigrants | P value |
| 11-20 | 10 (47.6) | 23 (57.5) | 0.462 |
| 21-30 | 23 (85.2) | 122 (57.8) | 0.006 |
| 31-50 | 167 (75.2) | 34 (48.6) | < 0.0001 |
| Total | 200/280 (71.4) | 179/321 (55.7) | < 0.0001 |
