Supported by a Grant-in-Aid for Scientific Research (KAKENHI, Grant No. 13670407) from The Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.
Reference birth-length range for multiple-birth neonates in Japan
Article first published online: 12 JAN 2005
Journal of Obstetrics and Gynaecology Research
Volume 31, Issue 1, pages 43–49, February 2005
How to Cite
Kato, N. and Uchiyama, Y. (2005), Reference birth-length range for multiple-birth neonates in Japan. Journal of Obstetrics and Gynaecology Research, 31: 43–49. doi: 10.1111/j.1447-0756.2005.00248.x
- Issue published online: 12 JAN 2005
- Article first published online: 12 JAN 2005
- Received: May 6 2004. Accepted: November 15 2004.
- asymmetrical growth;
- birth length;
- gestational age;
Aim: To clarify the birth length of twins according to gestational age.
Methods: We studied a total of 51 910 live-birth–live-birth pairs of twins, 4561 triplet live births and 256 quadruplet live births, using data obtained from corresponding birth certificates. The birth length of twins was analyzed according to gestational age.
Results: Compared to singleton neonates, the median birth length of twins was approximately 0.5 cm smaller after the gestational age of 34 weeks, increasing to approximately 2.0 cm at 42 weeks of gestation. The median birth length according to gestational age was found to be the greatest in twins, lower in triplets and the lowest in quadruplets, in which the difference was <2.0 cm.
Conclusion: The birth length of twins was smaller than that of singletons, but the difference was smaller than the difference in birthweight between twins and singletons.