Gestational age, birth weight, and infant 1-year mortality risk: A large-scale analysis of 6.9 million births from the Japanese National registry.

ABSTRACT:

Background

Japan's low infant mortality rates (IMR) reflect advancements in neonatal care. However, a comprehensive understanding of factors influencing long-term infant mortality nationwide is lacking. We examined the 1-year relationships between gestational age (GA), birth weight, small-for-gestational-age (SGA) status, and infant mortality risk.

Objective

This study aimed to estimate the 1-year survival probability of infants stratified by GA, birth weight and SGA status.

Methods

This study is an observational study using Japan's vital registration data between 2012 and 2018. Whole national birth and death registration data was analyzed. 6,918,305 births and 12,440 deaths within the first year of age were included. The main outcome is 1-year infant mortality and su

SUBMITTER: Sassa M 

PROVIDER: S-EPMC12574836 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature