Up to an estimated 1 in every 1,000 pregnancies is molar. Various factors are associated with molar pregnancy, including:

  • Maternal age. A molar pregnancy is more likely for a woman older than age 35 or younger than age 20.
  • Previous molar pregnancy. If you've had one molar pregnancy, you're more likely to have another. A repeat molar pregnancy happens, on average, in 1 to 2 out of every 100 women.
Oct. 24, 2014

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