Abstract: Objective　To explore the prevalence of preterm small for gestational age (SGA) infants in Guangdong. Methods　The data were from the Guangdong Birth Certificate System. The descriptive statistical methods were used to analyze the prevalence trend of preterm SGA infants and the distribution in Guangdong. Results　From 2014 to 2019, 474 459 single live birth records in Guangdong were included into the study. The prevalence rates of preterm SGA infants in Guangdong from 2014 to 2019 were 8.00% (6 209/77 636), 8.03% (5 854/72 933), 7.28% (6 395/87 815), 7.81% (6 308/80 817), 7.59% (6 055/79 757), and 7.68% (5 801/75 501), respectively. The prevalence rate of preterm SGA infants in the Pearl River Delta was the lowest [7.42% (21 564/290 651)], and that in the Eastern Guangdong the highest [8.85% (4 967/56 117)]. Conclusions　The prevalence of preterm SGA infants in Guangdong is on a moderate level. The difference between the four regions is statistically significant, suggesting that regions and childbearing policy may be the risk factors of preterm SGA infants.

Key words: Preterm small for gestational age infants, Prevalence, Variation trend

摘要： 目的　了解广东省早产小于胎龄儿的发病情况。方法　数据来源于广东省出生医学证明管理信息系统，采用描述性分析的方法对广东省的早产小于胎龄儿的发病趋势和地域分布情况进行研究。结果　共纳入了2014至2019年广东省出生的474 459例早产单活胎，其中早产小于胎龄儿36 622例，总体发病率为7.72%。2014至2019年每年早产小于胎龄儿的发病率分别为8.00%（6 209/77 636）、8.03%（5 854/72 933）、7.28%（6 395/87 815）、7.81%（6 308/80 817）、7.59%（6 055/79 757）、7.68%（5 801/75 501），珠三角地区的发病率最低，为7.42% （21 564/290 651），粤东地区发病率最高，为8.85% （4 967/56 117）。结论　广东省早产小于胎龄儿的发病率在世界范围内处于中等水平，但广东省内各区域间存在一定的差异，地域、二胎政策可能是影响早产小于胎龄儿发生的因素。

关键词: 早产小于胎龄儿, 发病率, 变化趋势