Results: The prevalence of trisomies was 9.4%, among which trisomy 21 and trisomy 18 accounted for 68.8% and 31.2%, respectively; none of them was trisomy 13.
Kết quả: Tỷ lệ trisomy được chẩn đoán là 9,4%; trong đó, trisomy 21 chiếm 68,8%, trisomy 18 chiếm 31,2%, không phát hiện thai trisomy 13.