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Non-numeric variables risk factors for HBV transmission
| Variable | Anti-HBc | n | Mean | SE | Minimum | Maximum | P |
| Age (yr) | Positive | 30 | 47.7 | 11.9 | 26 | 78 | 0.001 |
| Negative | 146 | 39.0 | 13.9 | 18 | 84 | ||
| Diagnose time (mo) | Positive | 30 | 114.1 | 109.3 | 8 | 372 | 0.37 |
| Negative | 146 | 89.9 | 90.4 | 1 | 600 | ||
| Colonoscopy number | Positive | 30 | 2.3 | 1.9 | 0 | 10 | 0.52 |
| Negative | 146 | 2.1 | 1.6 | 1 | 8 |
