The total number of pregnancies in the 54 couples with chromosomal anomalies was 181, but they resulted in only 18 normal liveborn neonates, indicating a 90.1% abortion rate.

• 54对染色体异常的夫妇中总怀孕人次是181，但他们只有18正常存活新的生儿，这表明人工流产率为90.；1 %25 。