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| Trend analysis of body mass index value of women during the preparing pregnancy after the implementation of the two-child policy |
| 1. School of Public Health, Lanzhou University, Lanzhou, Gansu Province, 730000; 2. National Research Institute for Family Planning, Beijing |
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Abstract To analyze the trend of the body mass index (BMI) value of women during the preparing pregnancy after the implementation of the two-child policy. Methods: A total of 33 335 352 Han Chinese women who wanted pregnancy and had participated in the National Free Pre-pregnancy Health Checkup Program in 20132019 were included in this study. The average BMI value, the overweight rate, and the obesity rate of the women were calculated monthly. The primiparae in these women were included in control group, and the pluriparae in these women were included in study group. A controlled interruption time series analysis was conducted to obtain the trend of the BMI value of women before and after the implementation of the two-child policy. Results: Compared with those of the women in the control group, the mean monthly BMI value change of the women in the study group was 10.01×10-2kg/m2 (95%CI-0.07-19.94, P=0.05), and the change of the overweight/obesity rate of the women in the study group was 1.36% (95%CI 0.36%-2.35%, P<0.01). The results of subgroup analysis showed that the change of overweight rate of the women with age ≥35 years old, less than high school education level, or the farmer occupation in the study group was significantly higher than that of the women in the control group (P<0.05), and the obesity rate of the women with age ≥35 years old, and the average GPT of 40 000-50 000 Yuan, or reside in the first-tier city in the study group had significantly different from that of the women in the control group. In the trend change, the trend change of obesity rate of the women with the aged of 30-35 years old, the per capita GPT 50 000-70 000 Yuan or ≥70 000 Yuan, or reside in the second, the fourth, or the fifth tier cities had increased significantly (P<0.05), the trend change of overweight rate of the women with the aged of 30-50 years old, or reside in the third-tier city had increased significantly (P<0.05), and the trend change of overweight/obesity rate of the women with high school or above education level, vocational workers, or reside in the first or the third tier cities had decreased significantly (P<0.05). Conclusion: After the implementation of the universal two-child policy, there is little change in the overall trend of the BMI value among the women who are ready for pregnancy, and there are differences in the different social demographic characteristics and the different social development degree. The weight management of the women with planned pregnancy should be carried out to improve the health of the women of childbearing age.
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