Related Experiment Video
Updated: Aug 8, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
Published on: September 5, 2011
Twinning in Sweden between 1973 and 1990. The recurrence rate
1Department of Obstetrics and Gynecology, University Hospital, Lund, Sweden. Hakan.Rydhstrom@gyn.lu.se
Aim:
To ascertain the recurrence rate of twinning, by determining the repeat frequency in a population-based material of women who have already had one set of twins.
Material And Methods:
All singleton and twin births in Sweden between 1973 and 1990 were identified from the Medical Birth Registry (MBR), at the National Board of Health and Welfare, Stockholm. In the MBR fewer than 1% of all women with a singleton birth and fewer than 3% of all women with a twin birth are missing. When appropriate, 95% confidence limits (95% CL) were calculated.
Results:
Altogether, 84 women with at least two twin births were identified. When the proband twins were like-sexed, the observed/expected ratio was 1.7 (95% CL 1.3, 2.2). For unlike-sexed proband twin pairs, the corresponding figures were 3.3 (95% CL 2.3, 4.7).
Conclusion:
For women with one twin birth, the likelihood of having twins in a subsequent birth increases two to three-fold.
More Related Videos
09:52Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye
Published on: September 5, 2011
09:51Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators
Published on: March 21, 2018
Related Concept Videos
Probability Laws
Nondisjunction
Longitudinal Research
Nondisjunction
Nondisjunction
Ovarian Cycle