Chronic kidney disease （CKD） has become a worldwide public health problem, and currently, it affects approximately 10% of adults in the United States[I]. Meanwhile, it also has emerged as an important social challen...Chronic kidney disease （CKD） has become a worldwide public health problem, and currently, it affects approximately 10% of adults in the United States[I]. Meanwhile, it also has emerged as an important social challenge in China[2]. CKD has been reported to be a major risk factor for cardiovascular diseases, premature death, and end-stage renal diseaseTM. Thus, it is necessary to determine the risk factors for CKD.展开更多
Objective To explore the influence of secular trends in body height and weight on the prevalence of overweight and obesity among Chinese children and adolescents. Methods The data were obtained from five cross-section...Objective To explore the influence of secular trends in body height and weight on the prevalence of overweight and obesity among Chinese children and adolescents. Methods The data were obtained from five cross-sectional Chinese National Surveys on Students＇ Constitution and Health. Overweight/obesity was defined as BMI-for-age Z-score of per the Wold Health Organization （WHO） reference values. Body height and weight for each sex and age were standardized to those reported in 1985 （standardized height＂ SHY, standardized weight： SWY） and for each sex and year at age 7 （standardized height： SHA; standardized weight： SWA） using the Z-score method. Results The prevalence of overweight/obesity in Chinese children was 20.2% among boys and 10.7% among girls in 2010 and increased continuously from 1985 to 2010. Among boys and girls of normal weight, SHY and SHA were significantly greater than SWY and SWA, respectively （P 〈 0.001）. Among boys and girls with overweight/obesity, SHY was significantly lower than SWY （P 〈 0.001）, and showed an obvious decreasing trend after age 12. SHA was lower than SWA among overweight boys aged 7-8 years and girls aged 7-9 years. SHY/SHW and SHA/SWA among normal-weight groups were greater than among overweight and obese groups （P 〈 0.001）. Conclusion The continuous increase in the prevalence of overweight/obesity among Chinese children may be related to a rapid increase in body weight before age 9 and lack of secular increase in body height after age 12.展开更多
Left-behind children comprise a special population inChinese rural areas. According to the 2007 China Census,the number ofleft-behind children aged≤14 years was estimated at 58 million which suggested that these chil...Left-behind children comprise a special population inChinese rural areas. According to the 2007 China Census,the number ofleft-behind children aged≤14 years was estimated at 58 million which suggested that these childrencon stituted a展开更多
Objective The purpose of this study was to explore an objective measure to assess actual body shape of children and adolescents in China. Methods Based on the Chinese National Survey on Student＇s Constitution and He...Objective The purpose of this study was to explore an objective measure to assess actual body shape of children and adolescents in China. Methods Based on the Chinese National Survey on Student＇s Constitution and Health （CNSSCH） in 2005, 210 927 children and adolescents＇ （7-18 years） body height, body weight, chest circumference, sitting height, chest circumference-height ratio, chest circumference-sitting height ratio, chest circumference-low limb ratio, and sitting height-low limb ratio measurements were used to develop an objective measure by using transformation variables and explored factor analysis （EFA）. Discrimination power of the objective measure was evaluated based on BMI reference and Receiver Operating Characteristic curves （ROC）. Results The objective measure included four dimensions scores：transverse dimension （TD） indicating weight and chest circumference; length dimension （LD） indicating height and sitting height;transverse-length ratio dimension （TLD） indicating chest circumference-height ratio, chest circumference-sitting height and chest circumference-low limb ratio; proportion dimension （PD） indicating sitting height-low limb ratio. The whole dimension （WD） indicating the whole body shape was showed by the average of four dimensions scores. Four dimensions and WD scores were approximately 80 in children and adolescents with normal weight, and higher than those of overweight, obesity, and underweight （all P-values〈0.001）. Areas under ROC of overweight and obesity compared with normal weight ranged from 0.88 to 1.00 for scores of TD, TLD, and WD. Conclusion The objective measure which included four dimensions was explored, and TD, TLD, and WD had significant discrimination power.展开更多
Adverse impact of icing,on either infrastructures or facilities,is the great impulsion for seeking anti-icing coatings with high performance.In this work,durable icephobic coatings with self-regulated surface patterns...Adverse impact of icing,on either infrastructures or facilities,is the great impulsion for seeking anti-icing coatings with high performance.In this work,durable icephobic coatings with self-regulated surface patterns were developed from branched polydimethylsiloxane(PDMS)co-crosslinked with fluorinated polyhedral oligomeric silsesquioxane(POSS)through a breath figure method.The prepared coatings with patterned microstructures on the surfaces exhibited excellent anti-icing performance ascribed to micro-crack generation between ice and coating surface under a small external force.The stable cross-linked network composed of branched PDMS and fluorinated POSS endowed the coatings with durability and abrasion resistance.Low ice shear strength was achieved at approximate 19.7±2.5 kPa on coating surface with self-regulated honeycomb pattern.After experiencing 30 icing/deicing cycles,the ice shear strength of the coating varied slightly.Additionally,owing to dedication of fluorinated POSS,the coating showed merely a little increase in ice shear strength after more than 1600 abrasion cycles,which was still in the icephobic range below 50 kPa.Hence,the prepared coatings with remarkably enhanced anti-icing performance and superior mechanical stability would be promising for the practical applications.展开更多
基金supported by National Natural Science Foundation of China (No.81273507)Humanity and Social Science Foundation for the Youth Scholars of China's Ministry of Education (No.08JC840021)
文摘Chronic kidney disease （CKD） has become a worldwide public health problem, and currently, it affects approximately 10% of adults in the United States[I]. Meanwhile, it also has emerged as an important social challenge in China[2]. CKD has been reported to be a major risk factor for cardiovascular diseases, premature death, and end-stage renal diseaseTM. Thus, it is necessary to determine the risk factors for CKD.
基金supported by the National Natural Science Foundation of China(81502823)
文摘Objective To explore the influence of secular trends in body height and weight on the prevalence of overweight and obesity among Chinese children and adolescents. Methods The data were obtained from five cross-sectional Chinese National Surveys on Students＇ Constitution and Health. Overweight/obesity was defined as BMI-for-age Z-score of per the Wold Health Organization （WHO） reference values. Body height and weight for each sex and age were standardized to those reported in 1985 （standardized height＂ SHY, standardized weight： SWY） and for each sex and year at age 7 （standardized height： SHA; standardized weight： SWA） using the Z-score method. Results The prevalence of overweight/obesity in Chinese children was 20.2% among boys and 10.7% among girls in 2010 and increased continuously from 1985 to 2010. Among boys and girls of normal weight, SHY and SHA were significantly greater than SWY and SWA, respectively （P 〈 0.001）. Among boys and girls with overweight/obesity, SHY was significantly lower than SWY （P 〈 0.001）, and showed an obvious decreasing trend after age 12. SHA was lower than SWA among overweight boys aged 7-8 years and girls aged 7-9 years. SHY/SHW and SHA/SWA among normal-weight groups were greater than among overweight and obese groups （P 〈 0.001）. Conclusion The continuous increase in the prevalence of overweight/obesity among Chinese children may be related to a rapid increase in body weight before age 9 and lack of secular increase in body height after age 12.
基金supported by grants from the National Natural Science Foundation of China [81172680]
文摘Left-behind children comprise a special population inChinese rural areas. According to the 2007 China Census,the number ofleft-behind children aged≤14 years was estimated at 58 million which suggested that these childrencon stituted a
基金supported by the Research Special Fund for Public Welfare of Health(201202010)
文摘Objective The purpose of this study was to explore an objective measure to assess actual body shape of children and adolescents in China. Methods Based on the Chinese National Survey on Student＇s Constitution and Health （CNSSCH） in 2005, 210 927 children and adolescents＇ （7-18 years） body height, body weight, chest circumference, sitting height, chest circumference-height ratio, chest circumference-sitting height ratio, chest circumference-low limb ratio, and sitting height-low limb ratio measurements were used to develop an objective measure by using transformation variables and explored factor analysis （EFA）. Discrimination power of the objective measure was evaluated based on BMI reference and Receiver Operating Characteristic curves （ROC）. Results The objective measure included four dimensions scores：transverse dimension （TD） indicating weight and chest circumference; length dimension （LD） indicating height and sitting height;transverse-length ratio dimension （TLD） indicating chest circumference-height ratio, chest circumference-sitting height and chest circumference-low limb ratio; proportion dimension （PD） indicating sitting height-low limb ratio. The whole dimension （WD） indicating the whole body shape was showed by the average of four dimensions scores. Four dimensions and WD scores were approximately 80 in children and adolescents with normal weight, and higher than those of overweight, obesity, and underweight （all P-values〈0.001）. Areas under ROC of overweight and obesity compared with normal weight ranged from 0.88 to 1.00 for scores of TD, TLD, and WD. Conclusion The objective measure which included four dimensions was explored, and TD, TLD, and WD had significant discrimination power.
基金supported by the Natural Science Foundation of Tianjin,China(Grant Nos.18JCQNJC03800,14ZCZDGX00008)the National Natural Science Foundation of China(Grant No.51273146)。
文摘Adverse impact of icing,on either infrastructures or facilities,is the great impulsion for seeking anti-icing coatings with high performance.In this work,durable icephobic coatings with self-regulated surface patterns were developed from branched polydimethylsiloxane(PDMS)co-crosslinked with fluorinated polyhedral oligomeric silsesquioxane(POSS)through a breath figure method.The prepared coatings with patterned microstructures on the surfaces exhibited excellent anti-icing performance ascribed to micro-crack generation between ice and coating surface under a small external force.The stable cross-linked network composed of branched PDMS and fluorinated POSS endowed the coatings with durability and abrasion resistance.Low ice shear strength was achieved at approximate 19.7±2.5 kPa on coating surface with self-regulated honeycomb pattern.After experiencing 30 icing/deicing cycles,the ice shear strength of the coating varied slightly.Additionally,owing to dedication of fluorinated POSS,the coating showed merely a little increase in ice shear strength after more than 1600 abrasion cycles,which was still in the icephobic range below 50 kPa.Hence,the prepared coatings with remarkably enhanced anti-icing performance and superior mechanical stability would be promising for the practical applications.
