Electrically Powered Wheelchairs Standards (GB/T 12996-1991) is being modified in China. With the help of the test methods from the international standard, European standard and Japanese standard, in contrast to Chinese national standards, the article discussed the new Electrically Powered Wheelchairs Standards.

Objective To measure the changes of portal venous pressure before and after APS by percutanous portal vein catheterization and to quantitatively analyse the correlation between portal pressure and portal hypertension.Methods All the 18 central arterioportal shunts (APS) patients with hepatocellular carcinoma (HCC) were treated with embolization of APS and TACE, and the pressure of portal vein was measured by percutaneous portal vein catheterization pre- and post-embolization of APS. Color dopplar sonography and endoscopy were employed to investigate before and 2 weeks after embolization in all patients. Results The pressure of portal vein decreased significantly after embolization, and the decreased rate was 5.4%-33.3% with the mean rate 20.1%. After the embolization, the width of portal vein decreased and the blood flow velocity of portal vein increased significantly, P

Objective To apply the combination evaluation model in the comprehensive evaluation of sci-tech influence of hospitals in China.Method 42 Grade-Ⅲll hospitals were selected and evaluated by analytic hierarchy process (AHP),principal components analysis and entropy method.Kendall's coefficient of concordance (W) was applied to check the coherence of the evaluation results from the three methods above.Average method,Borda method,Copeland method and fuzzy Borda method were used for combining the single evaluation result.Spearman rank correlation was then used for testing whether the combination evaluation results matched the single evaluation result.Result Kendall's W correlation test showed consistency among three single evaluation results.A strong correlation between each combination evaluation result and the single evaluation result was observed by Spearman rank correlation analysis.The average method was chosen as the best method based on the Spearman rank correlation coefficient.Conclusion The study confirmed that the combination evaluation method can be applied in evaluating sci-tech influence of hospitals in China.

Objective To optimize the indicator system of the scientific research influence of the tertiary hospitals in China for future use.Methods 200 tertiary hospitals was randomly selected in China and the indicator data were collected.Statistics methodologies including coefficient of variation,coefficient of correlation and principal component analysis were adopted to screen the indictors.Results 3 indicators including the number of researchers,the number of drug clinical trial institution and the cited frequency of the Chinese papers were removed in the new indicator system.There was high correlation between the modified indicator system and the primary one.Conclusions The optimized indictor system in our study is scientific and simple.It can be used for evaluating the scientific research influence of the tertiary hospitals in China.

Data Envelopment Analysis (DEA) method is used to evaluate the efficiency of 41 tertiary hospitals in 2015 in Beijing.The possible causes of non-DEA effective hospitals are analyzed,and the direction and measures of non-DEA effective hospitals to promote scientific research efficiency are put forward.

This paper introduces the standards and the market conditions of wheelchair in China, as well as the general quality of products of wheelchairs from the quality supervision and spot check, and puts forward some suggestions on how to improve the quality of wheelchairs in China.

Objective To measure the quality of manual wheelchairs made in China. Methods 20 wheelchairs was tested with ISO 7176-8, focused on the static strength, impact strength and fatigue strength. Results 8 (40%) wheelchairs passed the test. Conclusion The fatigue strength is the key factor of the wheelchair quality.

After the factors that influence the selection of words were analyzed according to the problems in selec-tion of words for co-word analysis, a hypothesis for how to select the word sets with its verification analysis was pro-posed, the method for selecting words was thus decided according to the word frequency-covered literature area and the number of high frequency words. However, its practical use in large data sets needs to be further improved.

Objective:To examine the concordance between bioelectrical impedance analysis (BIA) and dual energy X-ray absorptiometry (DXA) in determining body composition of children aged between 3 and 6.Methods:A total of 230 children aged 3-6 from a kindergarten in Jinnan, Tianjin were enrolled in this study from November 16 th to December 8 th, 2017.The soft lean mass (SLM) and the body fat mass (BFM) of the children were measured by using BIA and DXA.The children were divided into several groups by sex, age and body mass index (BMI). The consistency of the body composition results between BIA and DXA in each group was analyzed. Results:The SLM and BFM assessed by BIA were significantly correlated with those measured by DXA ( R2=0.951, 0.947, all P<0.001). The Bland-Altman plots suggested that the SLM measured by BIA was 0.70 kg(95% CI: -1.78-0.38) higher in that by DXA, and the BFM measured by BIA was 1.36 kg (95% CI: 0.19-2.52) lower in that by DXA.A similar trend could be seen in children stratified by age, sex and BMI.The SLM of boys and girls measured by BIA was 0.57 kg (95% CI: -1.63-0.49) and 0.84 kg (95% CI: -1.88-0.20) higher than those by DXA, respectively.The BFM of boys and girls measured by BIA was 1.23 kg (95% CI: 0.11-2.36) and 1.49 kg (95% CI: 0.34-2.64) lower than that by DXA, respectively.The SLM measured by BIA was 0.67 kg (95% CI: -1.74-0.41), 0.76 kg (95% CI: -1.65-0.13), 0.69 kg (95% CI: -1.85-0.47) and 0.67 kg (95% CI: -1.75-0.41) higher than those by DXA in the 3 to 6-year-old groups, respectively.The BFM measured BIA was 1.09 kg (95% CI: -0.12-2.30), 1.44 kg (95% CI: 0.60-2.28), 1.39 kg (95% CI: 0.15-2.64)and 1.43 kg(95% CI: 0.38-2.48)lower than that by DXA in the 3 to 6-year-old groups, respectively.Moreover, the smallest difference of the SLM and BFM were observed between BIA and DXA in the obese child.The SLM deviation between BIA and DXA was estimated within ± 0.39 kg and the BFM deviation was within ± 0.93 kg. Conclusions:There is high consistency between BIA and DXA in the assessment of the SLM and BFM of children aged from 3 to 6.

Objective To evaluate the scientific research efficiency of tertiary hospitals and analyze the influencing factors, providing reference for the decision-making of scientific research managers in China. Methods Evaluation indicators were collected from 100 tertiary hospitals in China, and their research efficiency was evaluated using Bootstrap data envelopment analysis (DEA) method. The influencing factors were analyzed using ordinary least square ( OLS) regression model. Results The averaged scientific research efficiency of these hospitals using Bootstrap DEA method was 0. 5224, lower than that using conventional DEA method (0. 0676), yet with a great variation (from 0. 1103 to 0. 8790) among them. Linear regression analysis showed that factors such as R&D input and output, and hospital types has statistical significance on the saentific research efficiency (P < 0. 05). Conclusions These hospitals are inefficient in scientific research with sizable room for improvement. Conventional DEA method should be used with caution, as deviations should be corrected with Bootstrap DEA method. The research development level and hospital types of their province can influence the research efficiency the hospitals significantly.