National and regional under-5 mortality rate by economic status for low-income and middle-income countries: a systematic assessment

Abstract

For all low-income and middle-income countries (excluding China) combined, the absolute disparities in under-5 mortality rate between the poorest and richest households have narrowed significantly since 1990, whereas the relative differences have remained stable. To further narrow the rich-and-poor gap in under-5 mortality rate on the relative scale, targeted interventions that focus on the poorest populations are needed.