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| Age | Antibody titer (mIU/mL) |
Total | P-value* | ||
|---|---|---|---|---|---|
| < 10 | 10 - < 100 | ≥ 100 | |||
| One year or less (%) | 3(10.3) | 10 (34.5) | 16 (55.2) | 29 (100) | 0.05* |
| More than one year (%) | 83 (35.6) | 81 (34.8) | 69 (29.6) | 233 (100) | |
| Total (%) | 86 (32.8) | 91(34.7) | 85 (32.5) | 262 (100) | |
*Significant.
