Q:

Regarding multiple gestation pregnancies, the following are true EXCEPT

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Regarding multiple gestation pregnancies, the following are true EXCEPT


  1. the reported incIdence of spontaneous twinning is lowest in the Asian races
  2. triplets are estimated to occur in 1in 86 2 pregnancies in the USA
  3. the incidence of monozygotic twins is unaffected by racial or familial factors
  4. the overall incidence of multifetal gestation is unchanged
  5. polyovular pregnancies are more frequent beyond the 2nd pregnancy

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(D). Although the incidence of spontaneous multifetal gestation has been stable overthe years, the overall incidence of multifetal gestation is increasing as a result of treatment of infertility with ovarian stimulants (ciomiphene, gonadotropins) and in vitro fertilization. Twins account for about 2.5% of births but about 20% of very low birthweight(VLBW)infants.

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