maternal mortality rate; maternal mortality ratio
Medical and public health term for the number of maternal deaths per live births, often expressed per 100,000 live births.
Japan's maternal mortality rate is low by global standards.
Improving the maternal mortality ratio is one of the international health goals.
乳児死亡率 refers to the infant mortality rate (deaths of children under one year), while 妊産婦死亡率 specifically concerns maternal deaths related to pregnancy and childbirth.
Compound of 妊産婦 (pregnant and nursing women) and 死亡率 (mortality rate). The term is a modern medical coinage.