Dependency ratios compare the size of some group within a population that is considered to be economically dependent (typically, children under age 15 and older persons over age 65) to another group that is considered economically active.
受抚养人比率是将人口中一组据认为经济上需要扶养（通常为15岁以下儿童和65岁以上老人）的人与另一组据认为从事经济活动的人相比较。