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Optimal cutoffs of Grip Strength for Definition as Weakness in the Elderly

Journal of Biosciences and Medicines 2014年第9期2卷 14-18页

作者： Renwei Dong Qi Guo Jiazhong Wang Department of Rehabilitation and Sports Medicine Tianjin Medical University Tianjin China

Objective:?To indentify Optimal cutoffs of grip strength for definition as weakness in the elderly. Methods: Our study population comprised 1317 subjects (mean ± SD age: 67.6 ± 6.0 years;44.3% men) from the Hangu area of Tianjin, China. Data collection includes general physical examination, biochemical indicators and questionnaire. Mobility limitation was defined as a 4-m walking speed < 0.8 m/s and grip strength represents muscle strength. According to the ROC curve model, the cut-off point of grip strength was calculated, when mobility limitation was selected as the target variables. Results: According to the results of ROC curve, In man, grip strength is lower than 32.45 kg, the strength is weaker, Sensitivity is 79.7% and Specificity is 64.9%, the AUC is 0.764 (p < 0.001);In women, grip strength is lower than 18.20 kg, the strength is weaker, Sensitivity is 53.3% and Specificity is78.1%, the AUC is 0.703 (p < 0.001). Conclusions: Cut points for weakness derived from this large, diverse sample of older adults may be useful to identify populations who may benefit from interventions to improve muscle strength and function.

关键词： cutoffs Elderly People Grip Strength Weakness

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An Inquiry about Seasonal cutoffs in Lower Reaches of the Yellow River

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Natural Disaster Reduction in China 1998年第3期 10-14页

ＡｎＩｎｑｕｉｒｙａｂｏｕｔＳｅａｓｏｎａｌＣｕｔｏｆｓｉｎＬｏｗｅｒＲｅａｃｈｅｓｏｆｔｈｅＹｅｌｏｗＲｉｖｅｒＺｈａｎｇＢａｏｘｉａｎｇ（ＳｈａｎｄｏｎｇＩｎｓｔｉｔｕｔｅｏｆＨｙｄｒａｕｌｉｃｓ）Ｗａｔｅｒｐｒ... 详细信息

ＡｎＩｎｑｕｉｒｙａｂｏｕｔＳｅａｓｏｎａｌＣｕｔｏｆｓｉｎＬｏｗｅｒＲｅａｃｈｅｓｏｆｔｈｅＹｅｌｏｗＲｉｖｅｒＺｈａｎｇＢａｏｘｉａｎｇ（ＳｈａｎｄｏｎｇＩｎｓｔｉｔｕｔｅｏｆＨｙｄｒａｕｌｉｃｓ）Ｗａｔｅｒｐｒｏｂｌｅｍｉｓｏｎｅｏｆｔｈｅｗｏ...

关键词： cutoffs Seasonal Lower An

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Population and Asset Distributions in Economically Competitive Activities： a Rate-Equation Approach

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Chinese Physics Letters 2004年第7期21卷 1216-1219页

作者： KEJian-Hong CAIXiao-Ou LINZhen-Quan SchoolofPhysicsandElectronicInformation WenzhouNormalCollegeWenzhou325027

We introduce a simple asset migration model for the wealth redistribution in economical activities, in which a unit of asset migrates from one individual to another whenever they interact. By means of the mean-field rate equation, we have analysed the dynamic behaviour of the system. In the random migration case, the asset distribution of individuals takes the standard Gaussian form and consistently decreases to zero at the end. As for the system in which only the richer can gain assets from the poorer, it is found that the individual asset distribution is discontinuous at a critical point and only the individuals with asset absolute value less than a cutoff value have a uniform and non-zero distribution. Moreover, the result shows that for the system with migration bias the assets of the individuals may have a cutoff value at each given time, which is different from the system without migration bias.

关键词： rate equations Statistical Biases system behavior bias(electronics) cutoffs critical point Bias Immigration Discontinuous

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Entropy of Nonstatic Black Hole with the Internal Global Monopole and the Generalized Uncertainty Relation

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Chinese Physics Letters 2005年第7期22卷 1608-1610页

作者：韩亦文刘守渔 DepartmentofComputerandEducationTechnology ChongqingEducationalCollegeChongqing400067 DepartmentofPhysics ChinawestNormalUniversityNanchong637002//DepartmentofPhysicsDaxianTeacher'sCollegeDazhou635000

The new equation of state density is obtained by the utilization of the generalized uncertainty relation. With the help of coordinates and the Wentzel-Kramers-Brillouin approximation, direct calculation of the scalar field entropy of the non-state black hole with an internal global monopole is performed. The entropy obtained from the calculation is proportional to the horizon area. The calculation can be free from convergence if without any cutoff, which is different from the brick-wall method. However, the pertinent result is limited.

关键词： entropy MONOPOLES BLACK HOLES (ASTRONOMY) cutoffs Coordinates WKB APPROXIMATION Uncertainty

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The Numerical Differentiation Formulae For The Fractional Derivatives And The Truncation Error Estimates

The Numerical Differentiation Formulae For The Fractional De...

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第五届国际自动控制联合会分数阶导数及其应用会议

作者： Zhi-zhong Sun Guang-hua Gao Department of Mathematics Southeast University Nanjing 210096P R China Department of Mathematics Southeast University Nanjing 210096 P R China

＜正＞In this article,we will report some numerical differentiation formulae for the fractional derivatives and the truncation error estimates.L1formula and shifted L1formula for Caputo derivatives of orderγ（0＜γ＜... 详细信息

关键词： numerical differentiation formulae fractional derivative truncation error fractional differential equation difference scheme truncation errors formula Numerical differentiation cutoffs LU1

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