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A - La fréquence de la trisomie 21 est la même quelle que soit le contexte socio- économique du patient atteint; B - La plupart des grossesses pour lesquelles le fœtus est trisomique 21 conduit à une fausse couche spontanée; C - Le principal facteur de risque est l'âge maternel avancé; D - L'âge paternel avancé n'est pas un facteur de risque majeur de la trisomie 21; E - Le risque d'une femme de 25 ans d'avoir un enfant trisomique 21 est d'environ 1/200.

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