Parity progression ratios
Encyclopedia
Parity progression ratios refers to the number of offspring
Offspring
In biology, offspring is the product of reproduction, of a new organism produced by one or more parents.Collective offspring may be known as a brood or progeny in a more general way...

 a female has borne. It is contrasted with gravidity
Gravidity
In medicine, gravidity refers to the number of times a woman has been pregnant, regardless of whether the pregnancies were interrupted or resulted in a live birth....

, which refers to the number of pregnancies, regardless of outcome.
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