目的 应用判别分析探讨不同指标对前列腺癌预测诊断中的应用价值。 方法 收集2008年1月－2011年9月经直肠超声检查并行经直肠超声引导下经会阴前列腺穿刺活检术，具有前列腺特异性抗原（PSA）、超声图像特征的941例患者以及其中含有血流阻力指数（RI）指标的200例患者的临床资料，采用最近距离及极大似然判别分析两种方法分别拟合患者年龄、血清PSA、经直肠前列腺超声声像图特征以及RI指标预测前列腺癌。 结果 最近距离判别分析显示RI对前列腺癌的判别无临床意义。联合患者年龄、超声检查和血清PSA值，判别结果提示超声、超声+年龄、年龄+超声+PSA三种判别的灵敏度逐渐增加。年龄+超声+PSA联合指标的灵敏度为88.89%，其错判率在20.00%以内。 结论 年龄+超声+PSA联合指标的极大似然判别分析可提高前列腺癌的诊断预测水平，避免前列腺穿刺给患者带来的痛苦，并给临床医生的临床诊断提供参考，有较好的应用价值。
ObjectivesTo evaluate the intention of having a second child among females of childbearing age after the implementation of China’s universal two-child policy so as to provide evidence for further studies.MethodsCNKI, VIP, WanFang Data, CSSCI, PubMed, EMbase and ScienceDirect databases were electronically searched to collect cross-sectional studies on the intention of females of childbearing age to have a second child from January 1st, 2016 to August 31st, 2019. Two reviewers independently screened literature, extracted data and assessed risk of bias of included studies. Then, meta-analysis was performed by using R software.ResultsA total of 15 studies involving 18 820 cases were included. The results of meta-analysis showed that the fertility rate for the second child of females of childbearing age was 0.42 (95%CI 0.37 to 0.47), and the result was stable. Subgroup analysis showed that the fertility rate of second child in eastern region was higher than that in western region (0.44 vs. 0.40), in rural areas was higher than that in non-rural areas (0.46 vs. 0.35), females aged 18 to 34 was higher than those aged above 35 (0.49 vs. 0.29), and non-working females was higher than that among working females (0.48 vs. 0.40). The fertility rate of the sex of the first child being female was higher than the sex of the first child was male (0.48 vs. 0.39). The fertility rate of the couple who were both the non-only child was higher than the couple who were both the only child and who was only child while the other was non-only child (0.46 vs. 0.41 vs. 0.40).ConclusionsSince the implementation of the “universal two-child policy” in China, the fertility rate of females of childbearing age with the intention of having a second child is lower, especially those females who are from the western regions and non-rural areas, aged above 35 and the sex of the first child is male and non-dual-non-couples. Due to the quantity and quality of the included studies, more high quality studies are required to verify the above conclusions in future.
目的 应用基于链式方程的填补方法处理医学研究中的数据缺失，并以填补后完全数据构建联合指标的logistic判别函数，判断其在前列腺癌的预测诊断中的应用价值。 方法 采用模拟研究，针对现实数据缺失情况模拟不同填补集结果，并以此对现实数据进行填补，以完整数据构建logistic判别，进行分析预测。 结果 填补结果随着填补次数的增加而逐渐接近真实值并趋于稳定。联合年龄、血清前列腺特异性抗原值、血流阻力指数及经直肠前列腺超声检查指标的logistic判别分析结果的灵敏度为82.39%，特异度为74.86%。 结论 联合指标分析可提高前列腺癌的诊断预测水平，以减轻患者穿刺痛苦。