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81.
目的:系统评价运动干预对大学生焦虑的影响,并提出最佳的干预方案。方法:使用Review Manager 5.3对纳入的14篇中文文献,1371名受试者通过设置的5个调节变量进行亚组分析。结果:运动干预对大学生焦虑情绪的影响效应量d=-1.09,锻炼时间(I2=91.3%)及干预周期(I2=84.0%)对运动干预和大学生焦虑情绪之间的关系有高异质性;干预内容(I2=68.9%)、干预强度(I2=62.9%)对运动干预和大学生焦虑情绪之间的关系存在中度异质性。结论:(1)运动干预可明显减缓大学生焦虑情绪;(2)相比其他运动,组合训练改善焦虑的效果最佳;(3)每次运动的锻炼30—60min、每周锻炼3次效果达到最优;(4)4—6周锻炼效果最明显;(5)中强度的干预效果最好。 相似文献
82.
Cogmed Working Memory Training (CWMT) is a commercial cognitive-training program designed to foster working-memory capacity. Enhanced working-memory capacity is then supposed to increase one's overall cognitive function and academic achievement. This meta-analysis investigates the effects of CWMT on cognitive and academic outcomes. The inclusion criteria were met by 50 studies (637 effect sizes).Highly consistent near-zero effects were estimated in far-transfer measures of cognitive ability (e.g., attention and intelligence) and academic achievement (language ability and mathematics). By contrast, slightly heterogeneous small to medium effects were observed in memory tasks (i.e., near transfer). Moderator analysis showed that these effects were weaker for near-transfer measures not directly related to the trained tasks. These results highlight that, while near transfer occurs regularly, far transfer is rare or, possibly, inexistent. Transfer thus appears to be a function of the degree of overlap between trained tasks and outcome tasks. 相似文献
83.
Xiao-hong Pan Ying-xue Chen Mei-xiang Xiang Geng Xu Jian-an Wang 《Journal of Zhejiang University. Science. B》2010,11(10):754-761
A meta-analysis was performed to address the efficacy and safety of paclitaxel-eluting stent (PES) in ST-segment elevation
myocardial infarction (STEMI) patients. A systematic literature search was conducted to identify all randomized clinical trials
in mortality, recurrent myocardial infarction (rMI), repeat revascularization (RR), and stent thrombosis (ST). A total of
4190 STEMI patients were enrolled in six randomized trials comparing PES with bare-metal stent (BMS). The pooled repeat revascularization
rate was 5.7% in PES group, significantly lower than 10.0% in BMS group with an odds ratio (OR) of 0.56, 95% confidence interval
(CI) [0.44, 0.72] (P<0.00001). No significant difference was found between PES and BMS groups in mortality at one year after the indexing procedure
(3.9% vs. 5.1%, OR 0.88, 95% CI [0.63, 1.21], P=0.42). Similarly, rMI rate did not differ significantly between the two groups (3.4% vs. 4.1%, OR 0.80, 95% CI [0.56, 1.13],
P=0.21). PES was also associated with the comparable pooled rate of definite stent thrombosis with BMS (2.3% vs. 2.4%, OR 0.81,
95% CI [0.52, 1.26], P=0.35). The results show that PES improved clinical outcomes in STEMI patients with a decreased need for repeat revascularization
and no concerns for safety. 相似文献
84.
Objective: To clarify the association of IL-6 polymorphisms and periodontitis, a meta-analysis of case-control studies and a systemic review were conducted. Material and methods: We performed a literature search using PubMed and Medline database to May 2009, with no restrictions. We also reviewed referebces from all retrieved articles. Six case-control studies involving 1093 periodontitis cases and 574 controls were selected for meta-analysis to assess the purported associations between IL-6 polymorphisms and the risk of periodontitis. IL-6 -174 G/C and -572 C/G polymorphisms were included in the present meta-analysis, and the association between IL-6 -6331 T/C polymorphism and the risk of periodontitis was adequately reviewed as well. Results and conclusion: The present meta-analysis indicates that the IL-6 -174 G allele could not modify the risk of chronic periodontitis, but increased the risk of aggressive periodontitis. And -572 C/G polymorphism is associated with the pathogenesis of periodontitis, including chronic periodontitis or aggressive periodontitis. 相似文献
85.
目的:系统评价体力活动对痴呆患者认知功能的干预效果。方法:计算机检索PubMed、Web of Science、The Cochrane Library、EMbase、Medline、CBM、CNKI、VIP和Wan Fang Data数据库中有关体力活动对痴呆患者认知功能的随机对照试验(RCTs),检索时限均从各个数据库收录起始年限至2018年7月27日,使用PEDro量表进行方法学质量评价,采用Revman5.3软件进行Meta分析,采用Stata14.0软件进行发表偏倚检验。结果:共纳入24个RCT,包括1581例痴呆患者。Meta分析结果显示:体力活动对痴呆患者整体认知功能(MD=2.17,95%CI:1.50,2.84,P<0.00001)有积极的影响。亚组分析结果显示:体力活动对AD患者(MD=2.40,95%CI:1.58,3.23,P<0.00001)与合并AD患者(MD=1.45,95%CI:0.41,2.48,P=0.006)的整体认知功能优于对照组;有氧运动(MD=2.43,95%CI:1.63,3.23,P<0.00001)与混合运动(MD=1.48,95%CI:0.08,2.87,P=0.04)对痴呆患者整体认知功能优于对照组,但抗阻运动(MD=1.70,95%CI:-0.15,3.55,P=0.07)与太极拳运动(MD=0.92,95%CI:-2.98,4.82,P=0.64)与对照组差异无统计学意义;高频率体力活动(MD=1.64,95%CI:0.25,3.04,P=0.02)与低频率体力活动(MD=2.33,95%CI:1.57,3.09,P<0.00001)对痴呆患者的整体认知功能均优于对照组。不同认知领域Meta分析结果显示:体力活动对痴呆患者执行功能(SMD=0.08,95%CI:-0.05,0.20,P=0.22)、TMT-A与TMT-B(SMD=-0.05,95%CI:-0.26,0.16,P=0.63)和记忆功能(SMD=0.15,95%CI:-0.06,0.37,P=0.17)与对照组相比差异无统计学意义,只有注意力(SMD=0.18,95%CI:0.02,0.35,P=0.03)优于对照组。结论:体力活动干预对AD患者与合并AD患者的整体认知功能有积极影响,并且有氧与混合、高频率与低频率的体力活动干预对所有痴呆患者的整体认知功能同样有效,不同认知领域中只有注意力有改善效果。 相似文献
86.
This meta-analysis examined the relations between achievement goals and self-efficacy. One hundred and twenty-five studies consisting of 148 samples (N = 61,456) reporting the relations between academic achievement goals and academic self-efficacy were included. The correlations of mastery and mastery approach goals with self-efficacy were generally moderate to strong, while those of performance avoidance and mastery avoidance goals with self-efficacy were low. Goal valence was meaningfully related to self-efficacy, whereas the support for the goal definition was inconsistent. Publication status, proportion of males, mean age, and achievement goal measure did not exert significant moderating effects, whereas those for country where the research was conducted, the proportion of Caucasians, the self-efficacy measure, the domains of achievement goals and self-efficacy, and matching between achievement goal and self-efficacy domains varied with the achievement goal factor. The four-factor model was based on a relatively small number of samples, and so future research is needed to determine whether there are differences in correlations of mastery avoidance and performance avoidance goals with antecedents and consequences. 相似文献
87.
Lutz Bornmann Rüdiger Mutz Sven E. Hug Hans-Dieter Daniel 《Journal of Informetrics》2011,5(3):346-359
This paper presents the first meta-analysis of studies that computed correlations between the h index and variants of the h index (such as the g index; in total 37 different variants) that have been proposed and discussed in the literature. A high correlation between the h index and its variants would indicate that the h index variants hardly provide added information to the h index. This meta-analysis included 135 correlation coefficients from 32 studies. The studies were based on a total sample size of N = 9005; on average, each study had a sample size of n = 257. The results of a three-level cross-classified mixed-effects meta-analysis show a high correlation between the h index and its variants: Depending on the model, the mean correlation coefficient varies between .8 and .9. This means that there is redundancy between most of the h index variants and the h index. There is a statistically significant study-to-study variation of the correlation coefficients in the information they yield. The lowest correlation coefficients with the h index are found for the h index variants MII and m index. Hence, these h index variants make a non-redundant contribution to the h index. 相似文献
88.
X-ray repair cross-complementing group 1 (XRCC1) plays a key role in the base excision repair pathway, as a scaffold protein that brings together proteins of the DNA repair complex. Several studies have reported contradictory results for XRCC1 exon 6 C>T (rs1799782) gene polymorphism and cancer risk in Indian population has provided inconsistent results. Therefore, we have performed this meta-analysis to evaluate the relationship between XRCC1 exon 6 C>T gene polymorphism and risk of cancer by published studies. We searched PubMed and Google scholar web databases to cover all studies published on association between XRCC1 exon 6 C>T gene polymorphism and cancer risk. The meta-analysis was carried out and pooled odds ratios (ORs) and 95% confidence intervals (95% CIs) were used to appraise the strength of association. In order to derive a more precise estimation of the association, A total of 3197 confirmed cancer cases and 3819 controls were included from eligible seventeen case-controls studies. Results from overall pooled analysis demonstrated suggested that that variant allele (T vs. C: OR 1.301, 95% CI 1.003–1.688, p = 0.047) was associated with the risk of overall cancer. Other genetic models; heterozygous (TC vs. CC: OR 1.108, 95% CI 0.827–1.485, p = 0.491), homozygous (TT vs. CC: OR 1.479, 95% CI 0.877–2.493, p = 0.142), dominant (TT+TC vs. CC: OR 1.228, 95% CI 0.899–1.677, p = 0.196) and recessive (TT vs. TC+CC: OR 1.436, 95% CI 0.970–2.125, p = 0.071) did not reveal statistical association. Publication bias observation was also considered and none was detected during the analysis. The present meta-analysis suggested that the variant allele T of XRCC1 exon 6 gene polymorphism was associated with the risk of cancer. It is therefore pertinent to confirm this finding in a large sample size to divulge the mechanism of this polymorphism and cancer risk in Indian population. 相似文献
89.
Based on the Elaboration Likelihood Model (ELM), this study identifies the differences between perceived privacy risks and privacy concern. Furthermore, the study analyses how perceived privacy risks and privacy concerns affect the disclosure intention and the actual information disclosure behavior of Internet users. In addition, the study discusses the moderating effects of platform types, from the perspective of privacy elaboration likelihood. By applying meta-analyses and SEM on 104 independent studies with 42,256 samples from existing empirical studies, we attempt to systematically reveal the relationship between privacy cognition and information disclosure. The results show that perceived privacy risks can significantly reduce personal information disclosure intention, as well as actual information disclosure behavior. However, privacy concerns only affect disclosure intention, but do not have a significant effect on actual information disclosure behavior. The study also verified that platform types have moderating effects on the privacy decision making of Internet users. The findings yield important and useful implications, both for research and for practice. 相似文献
90.
Awareness of antecedents and consequences of trust in m-commerce can enable m-commerce service providers to design suitable marketing strategies. Present study conducted a meta-analysis of 118 related empirical studies. The results indicate that antecedents namely perceived usefulness, perceived ease of use, system quality, information quality, service quality, user interface, perceived risk, perceived security, structural assurance, ubiquity, and disposition to trust, while consequences namely attitude, user satisfaction, behavioral intention, and loyalty have significant relationship with trust in m-commerce. Further, all the relationships were found to be moderated by culture except perceived ease of use, disposition to trust, and attitude. 相似文献