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收集受精龄为4月～足月正常胎儿131例,测量其头、胸、腹围,结果上述指标增长随着胎龄增加而增加,但生长速度随着胎龄的增加而相对减慢,且表现为连续性和波动性。头、胸、膜围测量结果经回归分析得出以胎龄为自变量的回归方程.
131 normal fetuses of fertile age ranging from April to full term were collected and their head, chest and abdomen circumference were measured. The results showed that the above indexes increased with the increase of gestational age, but the growth rate was relatively slow with the increase of gestational age The performance of continuity and volatility. Head, chest and membrane measurements obtained by regression analysis of gestational age as an independent variable regression equation.