Supplementary Material for: Suggested Gestational Weight Gain for Chinese Women and Comparison with Institute of Medicine Criteria: A Large Population-Based Study

<b><i>Objective:</i></b> To establish suggested gestational weight gain (GWG) using several distinct methods in a Chinese population. <b><i>Methods:</i></b> This study analyzed data from the medical records of singleton pregnancy women during 2011–2017 in Beijing, China. Suggested GWG was calculated using four distinct methods. In method 1, suggested GWG was identified by the interquartile method. Subsequently, risk models for small for gestational age (SGA) and large for gestational age (LGA) with respect to GWG were constructed. GWG was treated as a continuous variable in method 2, and as a categorized variable in methods 3 and 4. <b><i>Results:</i></b> An average GWG of 15.78 kg with a prevalence of LGA at 19.34% and SGA at 2.12% was observed among the 34,470 participants. Methods 1 and 2 did not yield clinically applicable results. The suggested GWGs were 11–17/11–16 kg, 9–19/9–15 kg, 4–12/4–10 kg, and 0–12/0–6 kg by method 3/method 4 for underweight, normal-weight, overweight, and obese women, respectively. The GWG range suggested by method 3 resulted in a larger proportion of participants (62.03%) within range, while the suggested GWG range by method 4 was associated with a lower risk of LGA compared to that conferred by the Institute of Medicine (IOM) criteria. <b><i>Conclusion:</i></b> This study suggests a modest GWG goal compared to IOM recommendations based on a large Chinese cohort.

**研究目标：** 在中国人群中采用多种不同方法确立推荐妊娠期体重增长（gestational weight gain, GWG）标准。
**研究方法：** 本研究分析了2011至2017年中国北京地区单胎妊娠女性的医疗记录数据。采用四种不同方法计算推荐GWG：方法1通过四分位数法确定推荐GWG，随后构建与GWG相关的小于胎龄儿（small for gestational age, SGA）及大于胎龄儿（large for gestational age, LGA）风险模型；方法2将GWG作为连续变量进行分析，方法3与方法4则将GWG作为分类变量进行分析。
**研究结果：** 共纳入34470名受试者，其平均GWG为15.78kg，LGA患病率为19.34%，SGA患病率为2.12%。方法1与方法2未获得具有临床适用性的结果。针对体重过轻、体重正常、超重及肥胖女性，方法3/方法4的推荐GWG范围分别为11–17/11–16 kg、9–19/9–15 kg、4–12/4–10 kg及0–12/0–6 kg。方法3推荐的GWG范围可使62.03%的受试者体重增长处于该区间内；相较于美国医学研究所（Institute of Medicine, IOM）标准，方法4推荐的GWG范围与更低的LGA发病风险相关。
**研究结论：** 基于大型中国队列数据，本研究提出了相较于美国医学研究所（IOM）指南更为温和的妊娠期体重增长目标。