According to overseas estimates, about one woman in five to 10 thousand does not have a fully developed uterus for congenital reasons, but nonetheless has healthy ovaries. There are even more who have had a hysterectomy due to a medical condition, or whose womb is not functional.
據國外估計，先天子宮發育不全但仍保有健全卵巢的婦女，約五千到一萬名中就有一人，而因病切除子宮、子宮沒有功能的人數更多。