Objective:To establish a nomogram prediction model for severe postpartum hemorrhage in subsequent pregnancies after multiple cesarean sections.Methods:A retrospective analysis was performed for the clinical and imaging data of 395 pregnant and par-turient women with multiple cesarean section who were hospitalized for delivery from January 2021 to December 2023.Univariate analysis and multivariate logistic regression analysis were used to investigate the risk factors for severe postpartum hemorrhage in sub-sequent pregnancies after multiple cesarean sections.A nomogram prediction model was established and validated in terms of specific-ity,accuracy,and clinical decision-making utility.Results:Among the 395 patients,131 experienced severe postpartum hemorrhage,accounting for 33.16%.The univariate analysis showed that times of pregnancy,times of vaginal delivery,grade of hospitals for previ-ous surgeries,number of prenatal checkups during this time of pregnancy,pregnancy-induced hypertension,gestational diabetes,pla-centa previa,location of placenta,association between placenta and uterus,and whether emergency cesarean section was performed were risk factors for severe postpartum hemorrhage in subsequent pregnancies after multiple cesarean sections(P<0.05).The multivari-ate logistic regression analysis showed that times of pregnancy,number of prenatal checkups,gestational diabetes,position of placenta,and whether emergency cesarean section was performed were independent risk factors for severe postpartum hemorrhage in subsequent pregnancies after multiple cesarean sections(P<0.05).A nomogram prediction model was established based on these independent risk factors,which had an area under the ROC curve of 0.783(95%CI=0.732-0.834),and there was a good consistency between the pre-dicted probability curve and the observed frequency curve.When the probability of severe postpartum hemorrhage predicted by the nomogram model was within the range of 0.15-1.0,the model has a good value of clinical decision-making.Conclusion:The incidence rate of severe postpartum hemorrhage in this population can be re-duced by attending regular prenatal checkups,controlling preg-nancy complications,and reducing the rate of emergency cesarean section and the number of deliveries.The nomogram prediction model established in this study has certain clinical application prospects.

The list of occupational diseases reflecting the latest advances in the identification and recognition of occupational diseases, and providing guidance on the protection of workers' health rights and interests and the prevention, recording, notification and compensation of related occupational diseases. Diagnostic criteria for occupational diseases are an important basis for making diagnoses attributable to occupational diseases, and provide a theoretical basis for health monitoring of occupational groups and occupational hygiene supervision. This thesis starts with the definition of the occupational disease elaborates in detail the development history of list of occupational diseases in International Labour Organization (ILO) , compares the list of occupational diseases in China (2013 version) with the list of occupational diseases in international (2010 version) , and then introduces in detail the latest diagnostic standards of the major occupational diseases. And finally, it puts forward relevant suggestions on the list and diagnostic level of China's occupational diseases, so as to provide certain insights for the further improvement of the list and diagnostic standards of occupational diseases.

The list of occupational diseases reflecting the latest advances in the identification and recognition of occupational diseases, and providing guidance on the protection of workers' health rights and interests and the prevention, recording, notification and compensation of related occupational diseases. Diagnostic criteria for occupational diseases are an important basis for making diagnoses attributable to occupational diseases, and provide a theoretical basis for health monitoring of occupational groups and occupational hygiene supervision. This thesis starts with the definition of the occupational disease elaborates in detail the development history of list of occupational diseases in International Labour Organization (ILO) , compares the list of occupational diseases in China (2013 version) with the list of occupational diseases in international (2010 version) , and then introduces in detail the latest diagnostic standards of the major occupational diseases. And finally, it puts forward relevant suggestions on the list and diagnostic level of China's occupational diseases, so as to provide certain insights for the further improvement of the list and diagnostic standards of occupational diseases.

With the gradual resumption of international travel, cross-border population movement has become frequent again, risk assessment of imported malaria has important public health significance to maintain malaria elimination status in China. Currently, risk index system construction method, risk index method, mathematical model method, and infectivity-receptivity- vulnerability method are mainly used in imported malaria risk assessment in China. This paper summarizes the common evaluation methods in the risk assessment of imported malaria research in China to provide references for the further research.