The proportion of multiple births has risen rapidly worldwide. Multiple births are likely to affect birth weight, which results in low birth weight (LBW) of less than 2500 g, possibly, because multiples are more likely to be born prematurely or less than 37 weeks into pregnancy. Using data from South Korea, this study aims to estimate the contribution of the rise in multiples to the rise in LBW incidence.

中文翻译：

---

多胞胎和低出生体重：来自韩国的证据

多胞胎的比例在全球范围内迅速上升。多胞胎可能会影响出生体重，导致低出生体重 (LBW) 低于 2500 克，这可能是因为多胞胎更有可能早产或怀孕不到 37 周。本研究使用来自韩国的数据，旨在估计倍数上升对 LBW 发病率上升的贡献。