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| A cross-sectional study of the interpregnancy intervals and its influence factors of women with planned pregnancies in China |
| 1.Institute of Epidemiology and Statistics, School of Public Health, Lanzhou University, Lanzhou, Gansu Province, 730000; 2.National Research Institute for Family Planning, Beijing |
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Abstract To describe the current distribution of the interpregnancy intervals(IPI) of women with planned pregnancies in China, and to identify its influencing factors. Methods: The women of reproductive age who participated in the national free pre-pregnancy checkups project twice between January 2010 and December 2018 were selected as the study population. When performing the analysis, IPI was used as both quantitative and qualitative variables, and the women were divided into three groups bases on the qualitative variables, which including the women with <18 months of short IPI in group A, the women with ≥60 months of long IPI in group B and the women with 18-59 months of suitable IPI in the control group. Descriptive epidemiological methods were used to study the distribution of IPI of the women, and generalized linear regression models and logistic regression models were used to explore the factors influencing of IPI, and were used to estimate the indicator β of the associative strength by odds ratio(OR) and its 95% confidence intervals(CI). Results: The median IPI of the women in this study was 21.3 months, 40.7% of women had short IPI and 1.6% of women had long IPI. The risk of short IPI of those women aged ≥35 years old had decreased by 87.0%(95%CI 86.0-88.0) than those women aged 20-24 years old. Compared with those of the women with Han nationality, with lower than high school education level, with normal weight, or with history of adverse pregnancy outcomes in the previous delivery, the risk of short IPI of the women with ethnic minorities, with high school and above education level, with underweight, or with adverse pregnancy outcomes in the previous delivery had increased by 21.0%(95%CI 16.0-26.0), 3.0%(95%CI 1.0-5.0), 5.0%(95%CI 2.0-9.0) or 11.0%(95%CI 8.0-13.0), respectively. Compared with those of the women with rural household registration, with farmer occupation, with normal weight, without drinking, or with vaginal delivery in the previous delivery, the risk of short IPI of the women with urban household registration, with other occupation out of farmer, with overweight, with alcohol consumption, or with cesarean section in the previous delivery had reduced by 24.0%(19.0-28.0), 11.0%(95%CI 9.0-16.0), 8.0%(95%CI 6.0-10.0), 25.0%(95%CI 16.0-33.0) or 53.0%(95%CI 52.0-55.0), respectively. The risk of short IPI of the women from North China had significantly decreased than those women from the other regions of China(all P<0.05). Conclusion: Nearly half of the women with planned pregnancies in China experience either too short or too long IPI. In the future, the publicity and education should be strengthened for the women with short IPI susceptibility characteristics, such as low age, ethnic minorities, high school and above education level, underweight, rural householders, farmers, or experienced vaginal delivery or adverse pregnancy outcomes in the previous pregnancy, so as to help them to choose the appropriate IPI.
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