BACKGROUND Radiation pneumonitis(RP)is a severe complication of thoracic radiotherapy that may lead to dyspnea and lung fibrosis,and negatively affects patients’quality of life.AIM To carry out multiple regression an...BACKGROUND Radiation pneumonitis(RP)is a severe complication of thoracic radiotherapy that may lead to dyspnea and lung fibrosis,and negatively affects patients’quality of life.AIM To carry out multiple regression analysis on the influencing factors of radiation pneumonitis.METHODS Records of 234 patients receiving chest radiotherapy in Huzhou Central Hospital(Huzhou,Zhejiang Province,China)from January 2018 to February 2021,and the patients were divided into either a study group or a control group based on the presence of radiation pneumonitis or not.Among them,93 patients with radiation pneumonitis were included in the study group and 141 without radiation pneumonitis were included in the control group.General characteristics,and radiation and imaging examination data of the two groups were collected and compared.Due to the statistical significance observed,multiple regression analysis was performed on age,tumor type,chemotherapy history,forced vital capacity(FVC),forced expiratory volume in the first second(FEV1),carbon monoxide diffusion volume(DLCO),FEV1/FVC ratio,planned target area(PTV),mean lung dose(MLD),total number of radiation fields,percentage of lung tissue in total lung volume(vdose),probability of normal tissue complications(NTCP),and other factors.RESULTS The proportions of patients aged≥60 years and those with the diagnosis of lung cancer and a history of chemotherapy in the study group were higher than those in the control group(P<0.05);FEV1,DLCO,and FEV1/FVC ratio in the study group were lower than those in the control group(P<0.05),while PTV,MLD,total field number,vdose,and NTCP were higher than in the control group(P<0.05).Logistic regression analysis showed that age,lung cancer diagnosis,chemotherapy history,FEV1,FEV1/FVC ratio,PTV,MLD,total number of radiation fields,vdose,and NTCP were risk factors for radiation pneumonitis.CONCLUSION We have identified patient age,type of lung cancer,history of chemotherapy,lung function,and radiotherapy parameters as risk factors for radiation pneumonitis.Comprehensive evaluation and examination should be carried out before radiotherapy to effectively prevent radiation pneumonitis.展开更多
With a technique of GIS(Geographical Information System) and a method of multiple linear regression analysis, the spatial distribution of Shanghai land values and its relationship with some location factors are examin...With a technique of GIS(Geographical Information System) and a method of multiple linear regression analysis, the spatial distribution of Shanghai land values and its relationship with some location factors are examined in this paper. The database of land values consists of 166 land parcels leased during 1993-1994. The land value map shows that the spatial distribution of Shanghai land values has some distinct spatial features. Firstly, the highest land value areas are located along Nanjing Road, Huaihai Road and the Bund. Secondly, there is no conspicuous peak land value intersection within the CBD(Central Business District). Finally, The land values of Pudong are much lower than those of Puxi. The regression model between Shanghai land values and the selected location factors shows that Nanjing Road is the first important location factor affecting the spatial distribution of the land values, the city center is the second one and Huaihai Road is the third one. The Bund, the regional shopping centers and the transportation nodes have little influence on the land values. This relationship between Shanghai land values and the location factors is determined by the distribution of commercial activities, the characteristics of the CBD and the spatial form of the city.展开更多
Profitability has always been considered as a primary indicator of dividend payout by a company. There are factors other than profitability namely cash flows, debt equity ratio, retained earnings, sales growth, share ...Profitability has always been considered as a primary indicator of dividend payout by a company. There are factors other than profitability namely cash flows, debt equity ratio, retained earnings, sales growth, share prices of a company, capital expenditure and beta etc. that also affect dividend decisions of an organization. Existing literature suggests that dividend payout is positively related to profits, cash flows while CAPEX （capital expenditure） retained earnings, sales growth, share prices, beta, interest paid and debt equity ratio have inverse relationship. A set of 21 key variables have been identified that affect the dividend payout of a firm. Researchers in the past have used several proxies to represent these determinants. Authors have tried to find out which proxy variable is most relevant in the present scenario. The paper attempts to give a focused overview of the important dividend theories and empirically analyze the determinants of dividend behavior of Indian FMCG （Fast moving consumer goods） sector. The relationship between key variables has been explored with the aid of statistical techniques of factor analysis. Thus, the main theme of this study is to examine the various factors that influence the dividend policy decisions of FMCG firms in India.展开更多
This article aims to address the clustering effect caused by unorganized charging of electric vehicles by adopting a two-tier recommendation method.The electric vehicles(EVs)are classified into high-level alerts and g...This article aims to address the clustering effect caused by unorganized charging of electric vehicles by adopting a two-tier recommendation method.The electric vehicles(EVs)are classified into high-level alerts and general alerts based on their state of charge(SOC).EVs with high-level alerts have the most urgent charging needs,so the distance to charging stations is set as the highest priority for recommendations.For users with general alerts,a comprehensive EV charging station recommendation model is proposed,taking into account factors such as charging price,charging time,charging station preference,and distance to the charging station.Using real data from EV charging stations and ride-hailing vehicles in Xiamen City,Fujian Province,simulation analyses are conducted using Python for different periods of the day.The research results show that the stability of the multi-factor recommendation model in terms of service density variance,coverage rate,price cost,and distance cost outperform single-factor models.This indicates that our composite multi-factor recommendation model has significant practical value in resolving the clustering phenomenon caused by unorganized EV charging,optimizing the EV charging service system,and improving user satisfaction.展开更多
目的通过Meta分析确定中国老年慢性病共病的患病率和危险因素,为制定适合我国实际情况的老年人慢性病共病健康管理策略和社区干预方案提供科学依据。方法系统检索PubMed、Embase、Web of Science、Cochrane、中国期刊全文数据库(CNKI)...目的通过Meta分析确定中国老年慢性病共病的患病率和危险因素,为制定适合我国实际情况的老年人慢性病共病健康管理策略和社区干预方案提供科学依据。方法系统检索PubMed、Embase、Web of Science、Cochrane、中国期刊全文数据库(CNKI)、中国科技期刊全文数据库(VIP)、万方数据库以及中国生物医药文献数据库(CBM)等关于中国老年慢性病共病的患病率和危险因素的观察性研究。两名具有循证护理学习经验的研究者通过三轮筛选、文献评价、数据提取,采用Stata20.0软件对中国老年慢性病共病的患病率和危险因素依次进行Meta合并、敏感性分析和发表偏倚分析。结果中英文数据初检出相关文献2727篇,最终纳入14篇文献,总样本量54982例,提取影响因素14个。Meta分析结果显示,中国老年人慢性病共病患病率为44.9%,95%CI:34.1%~55.7%。中国老年人慢性病共病危险因素包括:年龄(≥70岁)、性别(女)、慢性病家族史、婚姻状况(单身、丧偶、离异)、BMI(≥24 kg/m^(2))、吸烟、饮酒,OR值和95%CI分别是1.40(1.28~1.53)、1.22(1.10~1.34)、2.15(1.87~2.46)、1.40(1.17~1.68)、1.59(1.03~2.43)、1.18(1.08~1.30)、1.20(1.02~1.42)。结论中国老年慢性病共病的患病率较高,其中年龄(≥70岁)、性别(女)、慢性病家族史、婚姻状况(单身、丧偶、离异)、BMI(≥24 kg/m^(2))、吸烟、饮酒是中国老年慢性病共病的危险因素。针对可改变的危险因素,未来应积极改善老年人不健康的生活方式,开展综合性的干预措施。展开更多
文摘BACKGROUND Radiation pneumonitis(RP)is a severe complication of thoracic radiotherapy that may lead to dyspnea and lung fibrosis,and negatively affects patients’quality of life.AIM To carry out multiple regression analysis on the influencing factors of radiation pneumonitis.METHODS Records of 234 patients receiving chest radiotherapy in Huzhou Central Hospital(Huzhou,Zhejiang Province,China)from January 2018 to February 2021,and the patients were divided into either a study group or a control group based on the presence of radiation pneumonitis or not.Among them,93 patients with radiation pneumonitis were included in the study group and 141 without radiation pneumonitis were included in the control group.General characteristics,and radiation and imaging examination data of the two groups were collected and compared.Due to the statistical significance observed,multiple regression analysis was performed on age,tumor type,chemotherapy history,forced vital capacity(FVC),forced expiratory volume in the first second(FEV1),carbon monoxide diffusion volume(DLCO),FEV1/FVC ratio,planned target area(PTV),mean lung dose(MLD),total number of radiation fields,percentage of lung tissue in total lung volume(vdose),probability of normal tissue complications(NTCP),and other factors.RESULTS The proportions of patients aged≥60 years and those with the diagnosis of lung cancer and a history of chemotherapy in the study group were higher than those in the control group(P<0.05);FEV1,DLCO,and FEV1/FVC ratio in the study group were lower than those in the control group(P<0.05),while PTV,MLD,total field number,vdose,and NTCP were higher than in the control group(P<0.05).Logistic regression analysis showed that age,lung cancer diagnosis,chemotherapy history,FEV1,FEV1/FVC ratio,PTV,MLD,total number of radiation fields,vdose,and NTCP were risk factors for radiation pneumonitis.CONCLUSION We have identified patient age,type of lung cancer,history of chemotherapy,lung function,and radiotherapy parameters as risk factors for radiation pneumonitis.Comprehensive evaluation and examination should be carried out before radiotherapy to effectively prevent radiation pneumonitis.
文摘With a technique of GIS(Geographical Information System) and a method of multiple linear regression analysis, the spatial distribution of Shanghai land values and its relationship with some location factors are examined in this paper. The database of land values consists of 166 land parcels leased during 1993-1994. The land value map shows that the spatial distribution of Shanghai land values has some distinct spatial features. Firstly, the highest land value areas are located along Nanjing Road, Huaihai Road and the Bund. Secondly, there is no conspicuous peak land value intersection within the CBD(Central Business District). Finally, The land values of Pudong are much lower than those of Puxi. The regression model between Shanghai land values and the selected location factors shows that Nanjing Road is the first important location factor affecting the spatial distribution of the land values, the city center is the second one and Huaihai Road is the third one. The Bund, the regional shopping centers and the transportation nodes have little influence on the land values. This relationship between Shanghai land values and the location factors is determined by the distribution of commercial activities, the characteristics of the CBD and the spatial form of the city.
文摘Profitability has always been considered as a primary indicator of dividend payout by a company. There are factors other than profitability namely cash flows, debt equity ratio, retained earnings, sales growth, share prices of a company, capital expenditure and beta etc. that also affect dividend decisions of an organization. Existing literature suggests that dividend payout is positively related to profits, cash flows while CAPEX （capital expenditure） retained earnings, sales growth, share prices, beta, interest paid and debt equity ratio have inverse relationship. A set of 21 key variables have been identified that affect the dividend payout of a firm. Researchers in the past have used several proxies to represent these determinants. Authors have tried to find out which proxy variable is most relevant in the present scenario. The paper attempts to give a focused overview of the important dividend theories and empirically analyze the determinants of dividend behavior of Indian FMCG （Fast moving consumer goods） sector. The relationship between key variables has been explored with the aid of statistical techniques of factor analysis. Thus, the main theme of this study is to examine the various factors that influence the dividend policy decisions of FMCG firms in India.
基金the Jiangsu Provincial College Students Innovation and Entrepreneurship Training Plan Project(Grant Number 202311276097Y).
文摘This article aims to address the clustering effect caused by unorganized charging of electric vehicles by adopting a two-tier recommendation method.The electric vehicles(EVs)are classified into high-level alerts and general alerts based on their state of charge(SOC).EVs with high-level alerts have the most urgent charging needs,so the distance to charging stations is set as the highest priority for recommendations.For users with general alerts,a comprehensive EV charging station recommendation model is proposed,taking into account factors such as charging price,charging time,charging station preference,and distance to the charging station.Using real data from EV charging stations and ride-hailing vehicles in Xiamen City,Fujian Province,simulation analyses are conducted using Python for different periods of the day.The research results show that the stability of the multi-factor recommendation model in terms of service density variance,coverage rate,price cost,and distance cost outperform single-factor models.This indicates that our composite multi-factor recommendation model has significant practical value in resolving the clustering phenomenon caused by unorganized EV charging,optimizing the EV charging service system,and improving user satisfaction.
文摘目的通过Meta分析确定中国老年慢性病共病的患病率和危险因素,为制定适合我国实际情况的老年人慢性病共病健康管理策略和社区干预方案提供科学依据。方法系统检索PubMed、Embase、Web of Science、Cochrane、中国期刊全文数据库(CNKI)、中国科技期刊全文数据库(VIP)、万方数据库以及中国生物医药文献数据库(CBM)等关于中国老年慢性病共病的患病率和危险因素的观察性研究。两名具有循证护理学习经验的研究者通过三轮筛选、文献评价、数据提取,采用Stata20.0软件对中国老年慢性病共病的患病率和危险因素依次进行Meta合并、敏感性分析和发表偏倚分析。结果中英文数据初检出相关文献2727篇,最终纳入14篇文献,总样本量54982例,提取影响因素14个。Meta分析结果显示,中国老年人慢性病共病患病率为44.9%,95%CI:34.1%~55.7%。中国老年人慢性病共病危险因素包括:年龄(≥70岁)、性别(女)、慢性病家族史、婚姻状况(单身、丧偶、离异)、BMI(≥24 kg/m^(2))、吸烟、饮酒,OR值和95%CI分别是1.40(1.28~1.53)、1.22(1.10~1.34)、2.15(1.87~2.46)、1.40(1.17~1.68)、1.59(1.03~2.43)、1.18(1.08~1.30)、1.20(1.02~1.42)。结论中国老年慢性病共病的患病率较高,其中年龄(≥70岁)、性别(女)、慢性病家族史、婚姻状况(单身、丧偶、离异)、BMI(≥24 kg/m^(2))、吸烟、饮酒是中国老年慢性病共病的危险因素。针对可改变的危险因素,未来应积极改善老年人不健康的生活方式,开展综合性的干预措施。
