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| Dose-response relationship between pre-pregnancy body mass index and gestational diabetes mellitus |
| LI Nana1, ZHANG Shijing1, CHEN Qiaomin1, LI Haoran2, WANG Yali2
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1. Department of Nutrition, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan 450007, China;
2. Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan 450007, China |
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Abstract Objective To explore the dose-response relationship between pre-pregnancy body mass index (BMI) and gestational diabetes mellitus (GDM), so as to provide insights into the cut-off values of pre-pregnancy BMI and optimizing GDM prevention and control strategies. Methods Pregnant women that admitted to Zhengzhou Central hospital in 2021 were recruited, and demographics, family history, pregnancy and delivery history and blood glucose levels during pregnancy were collected. The dose-response relationship between pre-pregnancy BMI and GDM was analyzed using restricted cubic spline (RCS) analysis. The predictive ability of pre-pregnancy BMI for GDM risk was evaluated using receiver operating characteristic (ROC) curve. Results A total of 2 279 participants were included in the study. The median age was 29.0 (interquartile range, 5.0) years. The median pre-pregnancy BMI was 21.1 (interquartile range, 3.8) kg/m2. There were 312 underweight women (13.69%), 825 women with low-normal weight (36.20%), 730 women with high-normal weight (32.03%), 345 overweight women (15.14%) and 67 obese women (2.94%).The prevalence of GDM was 17.20%. RCS analysis suggested a linear dose-response relationship between age, pre-pregnancy BMI and GDM (P<0.05). When pre-pregnancy BMI was higher than 21.1 kg/m2, the risk of GDM increased with pre-pregnancy BMI (P<0.05). When women aged over 29.0 years, the risk of GDM increased with age, and the dose-response relationship of GDM caused by pre-pregnancy BMI was stronger in the women aged over 29.0 years than in the women aged 29.0 years and below (P<0.05). The area under curve (AUC) was 0.654 (95%CI: 0.624-0.684). If the cut-off value of pre-pregnancy BMI was 23.0 kg/m2, the Youden index, sensitivity and specificity was 0.238, 0.472 and 0.766, respectively. If it was 24.0 kg/m2, the Youden index, sensitivity and specificity was 0.195, 0.342 and 0.853, respectively. If it was 21.1 kg/m2, the Youden index, sensitivity and specificity was 0.213, 0.676 and 0.537, respectively. Conclusion There is a linear dose-response relationship between pre-pregnancy BMI and GDM, and higher than 21.1 kg/m2 of the pre-pregnancy BMI could increase the risk of GDM.
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Received: 25 April 2023
Revised: 05 July 2023
Published: 10 October 2023
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