Female siblings seem to have a better shot at survival than their male counterparts. Although more male twins conjoin in the womb than females, females are three times as likely as males to be born alive. Approximately 70% of all conjoined twins are girls.
Mortality rates for twins who undergo seperation vary, depending on their type of connection, and the organs they share. For example, twins joined at the sacrum at the base of the spine have a 68% chance of successful seperation, whereas in cases of twins with conjoined hearts at the ventricular (pumping chamber) level, there are no known survivors.
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