基于倾向性评分匹配方法的孕前使用避孕药和妊娠天数的相关性分析
庾静云, 甘展鹏, 姜碧, 曾思良
Correlation between contraceptive use before pregnancy and the days of pregnancy: a cohort study based on propensity score matching
YU Jing-yun, GAN Zhan-peng, JIANG Bi, ZENG Si-liang
实用预防医学
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2021, (6): 658
-660
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DOI: 10.3969/j.issn.1006-3110.2021.06.005
