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==Definition==

The '''abortion ratio''' for a population, typically measured in a given year (but with the measurement period variable in principle) is the number of abortions for every 1000 [[live birth]]s in the population. In other words:

<math>\mbox{Abortion ratio} = \frac{\mbox{Number of abortions}}{\mbox{Number of live births}} \times 1000</math>

The abortion ratio could be any nonnegative real value, and in principle may be more than 1000 (indicating more abortions than live births).

Note that the abortion ratio does not take into account the pregnancies that result in spotaneous fetal death, either in the numerator or in the denominator.