Birth weight reference for Japanese twins and risk factors for infant mortality: A population-based study.

ABSTRACT: There is no standard birth weight curve for twins in Japan other than a prototype curve based on 1988-1991. Twins have a high perinatal mortality rate than singletons; therefore, we developed a new standard curve for twin birth weight using data from the 1995-2016 Vital Statistics and compared it with previous reports. We used 469,064 cases for analysis, excluding stillbirths and cases with missing values, and created a standard curve using LMS (statistical methods to vary the distribution by using skewness, median, and coefficient of variation) method. In comparison with previous reports, the mean birth weight decreased by 100-200 g. The groups with the lowest neonatal death rates (NDRs) and infant death rates (IDRs) were those with a birth weight of 1,500-2,499 g (NDR: 0.3%, IDR: 0.6%) a

SUBMITTER: Ishida Y 

PROVIDER: S-EPMC9282560 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature