Question: Conjoined Twins FAQ: How Often Does It Happen?
Answer: Conjoined twinning is a fairly rare occurrence. Exact statistics are not known, but are estimated to be about 1 in 85,000 births. About 1 in 200 sets of identical twins are born conjoined.
Another estimate indicates that conjoined twins represent 1.47 cases per 100,000 births worldwide, according to findings from a database that collected details on 383 sets of conjoined twins that occurred among 26,138,837 births.
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