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| Status of symptoms | IgG positive (%) | IgG negative (%) | Exact significance (two-sided) |
| Symptoms present | 11 (15.3%) | 0 (0%) | 0.9 |
| Symptoms absent | 61 (84.7%) | 48 (100%) | |
| Total | 72 (100%) | 48 (100%) |
