Sustained decline in birth weight and increased rate of preterm infants born small for gestational age in Japan

Abstract

Background: Birth weights have continued to decline in Japan in recent years. However, secular trend changes such as the birth weight relative to the week of gestation remain to be explored. This study aimed to determine the trends over time in mean birth weight and small for gestational age (SGA) rate for each gestational week.

Methods: We used a large dataset of 27,015,792 births obtained from birth certificates between 1997 and 2021. Births from 22 to 41 weeks of gestation were evaluated in six groups (22-24, 25-27, 28-31, 32-33, 34-36, and 37-41 weeks of gestational age). For each group, secular trend changes in the z-scores calculated from standard birth weight values were assessed. Time trends in the proportion of SGA and mean birth weight z-scores were evaluated using the Cochran-Armitage trend test and linear regression analysis. Binomial logistic regression was performed to ascertain the effects of gestational age, sex, primiparity, number of births, and maternal age on the likelihood of SGA.

Results: The mean birth weight of preterm infants continued to decrease, and the z-score for mean birth weight decreased linearly, falling to -0.7 at 25-27 weeks of gestation from 1997-2001 (first period) to 2017-2021 (final period). Maternal age continued to increase from the first period to the last period for all weeks of gestation. There was a linear increase in the SGA rate in preterm infants born at <34 weeks. Odds ratios for the likelihood of SGA were 1.3 times higher for maternal age ≥40 years than that for 25-29 years (95% CI: 1.29-1.33, p < 0.001).

Conclusions: In Japan, there has been a continuous decline in birth weight and an increase in the rate of preterm SGA infants.

Keywords: advanced maternal age; low birth weight; nulliparous; parity; premature; preterm birth.

Figure 1

Secular trend in z-score of mean birth weight by weeks of gestation for boys (A) and girls (B) the trends in mean z-score of birth weight from the first period (1997–2001) to the last period (2017–2021) with 95% confidence intervals by sex.

Figure 2

Secular trend in the SGA rate for boys (A) and girls (B) the trends in the percentage of SGA from the first period (1997–2001) to the last period (2017–2021) by sex.

Figure 3

Secular trend in the proportion of maternal age. The proportion of mothers <30 years decreased linearly throughout the entire period, while the proportion of mothers ≥30 years increased linearly.