Secular rates of twinning in Asia: recent observations and review of literature.
OBJECTIVE
To study the rates of twinning in Asian countries using the most recent data available.


METHODS
A Medline search was performed and all primary and secondary references obtained.


RESULTS
Data was obtained from 5 Asian countries from reports published between 1983 and 1993. Total twinning rates varied.


CONCLUSIONS
Twinning among Asians is much more variable than had been reported previously. Further documentation in this area is indicated.
Shek
Y
Y
Department of Obstetrics and Gynecology, Loyola University Medical School, Illinois, USA.
Huang
A
A
Shek
Y
Y
Keith
L
L
D001208:Asia / Q000453:epidemiology; D006801:Humans; D007564:Japan / Q000453:epidemiology; D010507:Periodicity; D013624:Taiwan / Q000453:epidemiology; D014427:Twins / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology