Time of catching infection | Group | X2 P | |||||
Severe | Moderate | Mild | |||||
Before 20 weeks | 1 | 9.1 | 1 | 4.3 | 7 | 17.5 | 2.479 0.290 |
After 20 weeks | 10 | 90.9 | 22 | 95.7 | 33 | 82.5 | |
Total | 11 | 100.0 | 23 | 100.0 | 40 | 100.0 |
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