表 1.
两组孕妇年龄、身体质量指数和孕周情况
Comparison of maternal age, body mass index and gestational age between the two groups (Mean±SD)
| Groups | Age (year) | Gestational age (week) | BMI (kg/m2) |
| Control | 37±2 | 18±3 | 20.6±2.2 |
| Down syndrome | 39±4 | 19±5 | 21.5±2.1 |
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