Martin Joyce A, Osterman Michelle J K
NCHS Data Brief. 2019 Oct(351):1-8.
Following years of relative stability, twin births began to climb in the United States in the early 1980s, rising 79% from 1980 to 2014 (1,2). In 1980, one in every 53 births was a twin, compared with one in every 29 births in 2014 (1,2). The increase in twinning over the more than three decades was widespread, occurring across age and race and Hispanic-origin groups, and in all U.S. states (1,2). It is important to track twin birth rates as twins are at greater risk than singletons for poor outcomes, including preterm birth and neonatal morbidity and mortality (1,3,4). This report presents trends in twin childbearing overall for 1980-2018, and by maternal age, race and Hispanic origin, and state of residence for 2014-2018.
在经历了数年的相对稳定之后，美国的双胞胎出生率在20世纪80年代初开始攀升，从1980年到2014年增长了79%（1,2）。1980年，每53例出生中有1例是双胞胎，而2014年这一比例为每29例出生中有1例（1,2）。在三十多年里双胞胎出生率的增长很普遍，在各个年龄、种族和西班牙裔群体中以及美国所有州都出现了这种增长（1,2）。追踪双胞胎出生率很重要，因为双胞胎比单胎婴儿出现不良结局的风险更高，包括早产、新生儿发病率和死亡率（1,3,4）。本报告呈现了1980 - 2018年双胞胎生育的总体趋势，以及2014 - 2018年按母亲年龄、种族和西班牙裔血统以及居住州划分的趋势。
