5. Conclusion
For the first time, we established a set of fetal biometric parameter references stratified by chorionicity and mode of conception for Chinese twins, and the clinical significance lies in providing a useful tool for more accurate and comprehensive assessment of fetal growth in twins. This study provides new evidence that SC-MCDA twins grow slower than SC-DCDA twins, and the growth velocity of EFW, BPD, HC, FL and HL were statistically different between them. Meanwhile, our results showed that conception mode could affect the growth pattern of twins.