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The inclusion criteria of case and control group
| Inclusion Criteria | Case(mean ± SD) | Control(mean ± SD) |
|---|---|---|
| Number of previous spontaneous abortions | 2.00 ± 0.00 | 0.00 ± 0.00 |
| Age(years old) | 32.33 ± 0.58 | 31.67 ± 0.58 |
| Gestational age(weeks) | 7.66 ± 0.21 | 7.24 ± 0.17 |
