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What is the rate of natural fraternal (dizygotic: DZ) twinning?

April 26, 2017dizygotic dz fraternal natural rate twinning

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What is the rate of natural fraternal (dizygotic: DZ) twinning?

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Nigeria has the highest rate of natural fraternal twins at about 44.5 / 1000 births. Japan has the lowest rate of natural fraternal twinning at 2.3 / 1000 births. The differences across populations for fraternal twin rates are due to different genetic predispositions for the simultaneous ovulation of more than one egg caused by different amounts or responses to follicle stimulating hormone (FSH). For European-North American population of spontaneously conceived twins, roughly 70% are fraternal (dizygotic) and 30% are identical (monozygotic).