Sex ratio at birth

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This article describes a ratio measure. In the standard operationalization, the numerator of the measure is number of male live births (view other ratio measures with this numerator) and the denominator of the measure is number of female live births (view other ratio measures with this denominator). The denominator used for reporting is 100. The measurement period is a variable.

Definition

The sex ratio at birth (SRB) for a given population over a given time period is the ratio of the number of male live births in the population to the number of female live births to the population, scaled to 100, i.e., it is the number of male live births for every 100 female live births.

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