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Proportion of high-titre among active infection donors in different age groups
| Age group | TRUST titre <1∶8, (%) | TRUST titre ≥1∶8, (%) | χ2 trend | Ptrend value |
| Aged <25 years | 55 (48.7) | 58 (51.3) | 53.6 | <0.001 |
| Aged 25–34 years | 139 (65.9) | 72 (34.1) | ||
| Aged 35–44 years | 202 (83.1) | 41 (16.9) | ||
| Aged ≥45 years | 139 (83.7) | 27 (16.3) |
TRUST, toluidine red unheated serum test.
