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| IgG negative in the third trimester | IgG positive in the third trimester | Total | |
| IgG negative in the first trimester | 26 (81.25%) | 6 (18.75%) | 32 (100%) |
| IgG positive in the first trimester | 22 (25%) | 66 (75%) | 88 (100%) |
| Total | 48 (40%) | 72 (60%) | 120 (100%) |
