The estimated probability of dying between birth and the fifth birthday, in life table notation, 5q0. It is usually expressed as the ratio of deaths in those younger than 5 years to 1,000 live births and is regarded as one of the most useful and sensitive indicators of child health in low- and middle-income countries, where it may not be practicable to calculate infant mortality rates for the whole population. Instead, the under 5 mortality rate is estimated from responses of women in reproductive ages to questions in a demographic and health survey about the number of children they have borne and the number still alive. The rate can be directly estimated if detailed birth histories are available or indirectly estimated if only summary information is available.
Subjects: Public Health and Epidemiology.