胎儿肛殖距的性别差异及与孕龄的相关性分析

Gender difference of anal distance and its correlation with gestational age

目的探讨胎儿肛门与外生殖器的距离(以下简称“肛殖距”)的性别差异及与孕龄的相关性分析。方法选取2019年1月—9月首都医科大学大兴医院产检且孕龄≥20周的1488例胎儿为研究对象。依据性别将其分为男性胎儿组(933例)与女性胎儿组(555例);依据孕龄分为20~24周组(390例)、24+~28周组(240例)、28+~32周组(296例)、32+~36周组(216例)、>36周组(346例)。比较相同孕龄不同性别胎儿组的肛殖距及相同性别不同孕龄组胎儿的肛殖距;分析不同性别胎儿肛殖距与孕龄的相关性。结果相同孕龄男性胎儿组的肛殖距大于女性胎儿组,差异有统计学意义(P<0.05)。相同性别胎儿不同孕龄组肛殖距比较,差异有统计学意义(P<0.05)。男性、女性胎儿肛殖距与孕龄呈正相关(r=0.872、0.820,P<0.01)。男性胎儿肛殖距与孕龄的回归方程为Y=0.103X-1.213;女性胎儿肛殖距与孕龄的回归方程为Y=0.056X-0.623。结论临床在评估肛殖距时应参考胎儿的孕龄及性别。

Objective To investigate the gender difference of the distance between anus and external genitalia(“anal distance”for short)and its correlation with gestational age.Methods A total of 1488 fetuses with gestational age≥20 weeks were selected from Daxing Hospital Affiliated to Capital Medical University from January to September 2019.According to gender,they were divided into male fetus group(933 cases)and female fetus group(555 cases).According to gestational age,they were divided into 20-24 weeks group(390 cases)and 24+-28 weeks group(240 cases),28+-32 week group(296 cases),32+-36 week group(216 cases)and>36 week group(346 cases).The anal distance of different gender fetuses group in the same gestational age and the anal distance of different gestational age fetuses group in the same gender were compared;and correlation between gestational age and anal distance of different gender fetuses were analyzed.Results The anal distance of male fetuses group in the same gestational age was higher than that of female fetuses group,and the difference was statistically significant(P<0.05).There was statistically significant difference in the anal distance between different gestational ages group in the same gender fetuses(P<0.05).Anal distance of male and female fetuses were positively correlated with gestational age(r=0.872,0.820,P<0.01).The regression equation between anal distance and gestational age of male fetuses was Y=0.103X-1.213.The regression equation between anal distance and gestational age of female fetuses was Y=0.056X-0.623.Conclusion Gestational age and gender of fetus should be considered in clinical evaluation of anal distance.