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Abstract：
UNASSIGNED: To evaluate the risk factors for postpartum hemorrhage (PPH) according to the Robson Classification in a low-risk maternity hospital.
UNASSIGNED: We conducted retrospective cohort study by analyzing the medical records of pregnant women attended in a low-risk maternity hospital, during from November 2019 to November 2021. Variables analyzed were: maternal age, type of delivery, birth weight, parity, Robson Classification, and causes of PPH. We compared the occurrence of PPH between pregnant women with spontaneous (Groups 1 and 3) and with induction of labor (2a and 4a). Chi-square and Student t-tests were performed. Variables were compared using binary logistic regression.
UNASSIGNED: There were 11,935 deliveries during the study period. According to Robson\'s Classification, 48.2% were classified as 1 and 3 (Group I: 5,750/11,935) and 26.1% as 2a and 4a (Group II: 3,124/11,935). Group II had higher prevalence of PPH than Group I (3.5 vs. 2.7%, p=0.028). Labor induction increased the occurrence of PPH by 18.8% (RR: 1.188, 95% CI: 1.02-1.36, p=0.030). Model including forceps delivery [x2(3)=10.6, OR: 7.26, 95%CI: 3.32-15.84, R2 Nagelkerke: 0.011, p<0.001] and birth weight [x2(4)=59.0, OR: 1.001, 95%CI:1.001-1.001, R2 Nagelkerke: 0.033, p<0.001] was the best for predicting PPH in patients classified as Robson 1, 3, 2a, and 4a. Birth weight was poor predictor of PPH (area under ROC curve: 0.612, p<0.001, 95%CI: 0.572-0.653).
UNASSIGNED: Robson Classification 2a and 4a showed the highest rates of postpartum hemorrhage. The model including forceps delivery and birth weight was the best predictor for postpartum hemorrhage in Robson Classification 1, 3, 2a, and 4a.
UNASSIGNED: We conducted retrospective cohort study by analyzing the medical records of pregnant women attended in a low-risk maternity hospital, during from November 2019 to November 2021. Variables analyzed were: maternal age, type of delivery, birth weight, parity, Robson Classification, and causes of PPH. We compared the occurrence of PPH between pregnant women with spontaneous (Groups 1 and 3) and with induction of labor (2a and 4a). Chi-square and Student t-tests were performed. Variables were compared using binary logistic regression.
UNASSIGNED: There were 11,935 deliveries during the study period. According to Robson\'s Classification, 48.2% were classified as 1 and 3 (Group I: 5,750/11,935) and 26.1% as 2a and 4a (Group II: 3,124/11,935). Group II had higher prevalence of PPH than Group I (3.5 vs. 2.7%, p=0.028). Labor induction increased the occurrence of PPH by 18.8% (RR: 1.188, 95% CI: 1.02-1.36, p=0.030). Model including forceps delivery [x2(3)=10.6, OR: 7.26, 95%CI: 3.32-15.84, R2 Nagelkerke: 0.011, p<0.001] and birth weight [x2(4)=59.0, OR: 1.001, 95%CI:1.001-1.001, R2 Nagelkerke: 0.033, p<0.001] was the best for predicting PPH in patients classified as Robson 1, 3, 2a, and 4a. Birth weight was poor predictor of PPH (area under ROC curve: 0.612, p<0.001, 95%CI: 0.572-0.653).
UNASSIGNED: Robson Classification 2a and 4a showed the highest rates of postpartum hemorrhage. The model including forceps delivery and birth weight was the best predictor for postpartum hemorrhage in Robson Classification 1, 3, 2a, and 4a.
摘要：
■在低风险产科医院根据Robson分类评估产后出血（PPH）的危险因素。
我们通过分析在低风险妇产医院就诊的孕妇的医疗记录，进行了回顾性队列研究，从2019年11月到2021年11月。分析的变量是：产妇年龄，交货类型,出生体重,奇偶校验，罗布森分类,和PPH的原因。我们比较了自发性（第1组和第3组）和引产（2a和4a）孕妇之间PPH的发生率。进行卡方和学生t检验。使用二元逻辑回归比较变量。
■在研究期间有11,935例分娩。根据罗布森的分类，48.2%被分类为1和3(I组:5,750/11,935),26.1%被分类为2a和4a(II组:3,124/11,935)。II组的PPH患病率高于I组（3.5vs.2.7%,p=0.028)。引产使PPH发生率增加18.8%(RR:1.188,95%CI:1.02~1.36,p=0.030)。包括镊子分娩的模型[x2（3）=10.6，OR：7.26，95CI：3.32-15.84，R2Nagelkerke：0.011，p<0.001]和出生体重[x2（4）=59.0，OR：1.001，95CI：1.001-1.001，R2Nagelkerke：0.033，p<0.001]是预测Robson1，3，2a患者PPH的最佳4a。出生体重是PPH的不良预测指标（ROC曲线下面积：0.612，p<0.001，95CI：0.572-0.653）。
■Robson分类2a和4a显示产后出血率最高。在Robson分类1、3、2a中，包含产钳分娩和出生体重的模型是产后出血的最佳预测指标。4a。
我们通过分析在低风险妇产医院就诊的孕妇的医疗记录，进行了回顾性队列研究，从2019年11月到2021年11月。分析的变量是：产妇年龄，交货类型,出生体重,奇偶校验，罗布森分类,和PPH的原因。我们比较了自发性（第1组和第3组）和引产（2a和4a）孕妇之间PPH的发生率。进行卡方和学生t检验。使用二元逻辑回归比较变量。
■在研究期间有11,935例分娩。根据罗布森的分类，48.2%被分类为1和3(I组:5,750/11,935),26.1%被分类为2a和4a(II组:3,124/11,935)。II组的PPH患病率高于I组（3.5vs.2.7%,p=0.028)。引产使PPH发生率增加18.8%(RR:1.188,95%CI:1.02~1.36,p=0.030)。包括镊子分娩的模型[x2（3）=10.6，OR：7.26，95CI：3.32-15.84，R2Nagelkerke：0.011，p<0.001]和出生体重[x2（4）=59.0，OR：1.001，95CI：1.001-1.001，R2Nagelkerke：0.033，p<0.001]是预测Robson1，3，2a患者PPH的最佳4a。出生体重是PPH的不良预测指标（ROC曲线下面积：0.612，p<0.001，95CI：0.572-0.653）。
■Robson分类2a和4a显示产后出血率最高。在Robson分类1、3、2a中，包含产钳分娩和出生体重的模型是产后出血的最佳预测指标。4a。
