Hostname: page-component-586b7cd67f-rcrh6 Total loading time: 0 Render date: 2024-11-28T03:21:01.795Z Has data issue: false hasContentIssue false
  • English
  • Français

Conjoined Twins in Japan, 1979-1985

Published online by Cambridge University Press:  01 August 2014

Yoko Imaizumi
Yoko Imaizumi*
Affiliation:
Institute of Population Problems, Ministry of Health and Welfare, Tokyo, Japan
*
Institute of Population Problems, 2-2 1-Chome, Kasumigaseki, Chiyoda-Ku, Tokyo, Japan

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Nation-wide data in Japan on the 112 sets of conjoined twins from fetal deaths and from postnatal deaths during 1979-1985 were analysed. Female conjoined twins accounted for 60% of cases. The incidence rate of conjoined twins remained Constant except in 1985. Overall incidence rate was 10 per million births. Maternal age effect was found in mothers over the age of 40, where the highest incidence rate was obtained. The incidence rate of conjoined twins increased with birth order. There was no seasonal variation in the time of conception.

Keywords

Conjoined twinsMaternal ageBirth orderGeographical variationSeasonality
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 37 , Issue 3-4 , October 1988 , pp. 339 - 345
Copyright
Copyright © The International Society for Twin Studies 1988

References

REFERENCES

1. Bender, C (1967): Studies on symmetrically conjoined twins. J Pediatr 70: 1010–1011.Google Scholar
2. Bhettay, E, Beighton, P, Nelson, MM (1975): Epidemie of conjoined twins in Southern Africa? Lancet ii:741–743.Google Scholar
3. Edmonds, LD, Layde, PM (1982): Conjoined twins in the United States, 1970-1977. Teratology 25: 301–308.CrossRefGoogle ScholarPubMed
4. Japan, Ministry of Health and Welfare (1981–1987): Vital statistics, 1979-1985. Health and welfare Statistics and Information Department, Ministry of Health and Welfare, Tokyo (in Japanese).Google Scholar
5. Milham, S (1966): Symmetrical conjoined twins: An analysis of the birth records of twenty-two sets. J Pediatr 69: 643–647.Google Scholar
6. Viljoen, DL, Nelson, MM, Beighton, P (1983): The epidemiology of conjoined twinning in Southern Africa. Clin Genet 24: 15–21.Google Scholar
7. Zake, EZN (1984): Case reports of 16 sets of conjoined twins from a Uganda hospital. Acta Genet Med Gemellol 33: 75–80.Google Scholar