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"Publication bias"

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https://www.readbyqxmd.com/read/27903984/association-between-xrcc1-polymorphisms-and-the-risk-of-cervical-cancer-a-meta-analysis-based-on-4895-subjects
#1
Xianling Zeng, Yafei Zhang, Ting Yue, Taohong Zhang, Junxia Wang, Yan Xue, Ruifang An
The present meta-analysis was intended to explore the relationship between the x-ray repair cross complementing 1 (XRCC1) polymorphisms (Arg194Trp, Arg280His and Arg399Gln) and cervical cancer risk. Several electronic databases were searched systematically and bibliographies of relevant papers were identified carefully. Then, a meta-analysis was performed based on eligible studies in various genetic models. Pooled odds ratios (OR) with 95% confidence intervals (95% CI) were employed to evaluate the strength of associations between the XRCC1 polymorphisms and cervical cancer risk...
November 26, 2016: Oncotarget
https://www.readbyqxmd.com/read/27903364/-a-meta-analysis-of-hiv-seroprevalence-in-pregnant-women-with-syphilis-and-the-impact-of-syphilis-infection-on-mother-to-child-hiv-transmission
#2
T T Wang, Y Xu, Z Z Li, L Z Chen
Objective: To estimate HIV seroprevalence among pregnant women with syphilis and evaluate the influence of syphilis infection on mother-to-child-transmission (MTCT) of HIV by meta-analysis. Methods: We conducted a systematic literature search for 1 678 articles related to maternal syphilis and HIV infection published until October 1(st) 2015 using the PubMed, Web of Science, Chinese Web of Knowledge, Wanfang, Weipu, and SinoMed databases and evaluated the quality of each papers using the STROBE checklist, and the keywords were " pregnant women/maternal/pregnancy" , "syphilis/AIDS" , "HIV/human immunodeficiency virus" , "mother- to-child transimission/vertical transmission" ...
November 6, 2016: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/27903302/preventing-the-ends-from-justifying-the-means-withholding-results-to-address-publication-bias-in-peer-review
#3
EDITORIAL
Katherine S Button, Liz Bal, Anna Clark, Tim Shipley
The evidence that many of the findings in the published literature may be unreliable is compelling. There is an excess of positive results, often from studies with small sample sizes, or other methodological limitations, and the conspicuous absence of null findings from studies of a similar quality. This distorts the evidence base, leading to false conclusions and undermining scientific progress. Central to this problem is a peer-review system where the decisions of authors, reviewers, and editors are more influenced by impressive results than they are by the validity of the study design...
December 1, 2016: BMC Psychology
https://www.readbyqxmd.com/read/27903157/obesity-and-other-cancers
#4
Lin Yang, Bettina F Drake, Graham A Colditz
Purpose Evidence on overweight, obesity, and an increased risk of cancer continues to accumulate and was updated in the 2016 handbook on weight control from the International Agency for Research on Cancer (IARC). The underlying primary data, together with dose-response meta-analysis and, finally, pooled analysis of individual participant data, add insight into the relation between obesity and cancer risk and prognosis. We summarize the evidence for mortality from prostate cancer, hematologic malignancies, and kidney cancer...
December 10, 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/27901247/anabolic-steroids-for-rehabilitation-after-hip-fracture-in-older-people
#5
Vaqas Farooqi, Maayken E L van den Berg, Ian D Cameron, Maria Crotty
BACKGROUND: Hip fracture occurs predominantly in older people, many of whom are frail and undernourished. After hip fracture surgery and rehabilitation, most patients experience a decline in mobility and function. Anabolic steroids, the synthetic derivatives of the male hormone testosterone, have been used in combination with exercise to improve muscle mass and strength in athletes. They may have similar effects in older people who are recovering from hip fracture. OBJECTIVES: To examine the effects (primarily in terms of functional outcome and adverse events) of anabolic steroids after surgical treatment of hip fracture in older people...
September 2016: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/27900553/efficacy-and-safety-of-tranexamic-acid-in-reducing-blood-loss-in-scoliosis-surgery-a-systematic-review-and-meta-analysis
#6
REVIEW
Qiu-Ming Yuan, Zhi-Hu Zhao, Bao-Shan Xu
OBJECTIVE: The purpose of this systematic review and meta-analysis of randomized controlled trials (RCTs) and non-RCTs was to gather data to evaluate the efficacy and safety of tranexamic acid (TXA) versus placebo after a scoliosis surgery. METHODS: The electronic databases including Embase, PubMed, CENTRAL (Cochrane Controlled Trials Register), Web of Science, and Google database were searched to identify relevant studies published from the time of the establishment of these databases up to May 2016...
November 29, 2016: European Spine Journal
https://www.readbyqxmd.com/read/27899789/body-mass-index-can-increase-the-risk-of-gallbladder-cancer-a-meta-analysis-of-14-cohort-studies
#7
Hao Liu, Yong Zhang, Min Ai, Jun Wang, Bo Jin, Zhaowei Teng, Yansheng Wang, Li Li
BACKGROUND This study sought to appraise the association between raised body mass index (BMI) and the risk of gallbladder cancer (GBC) by performing a meta-analysis of 14 cohort studies. MATERIAL AND METHODS Eligible cohort studies were selected by searching PubMed and EMBASE from their inception to May 26, 2016, and the reference lists of retrieved articles were also consulted. The information was screened by two authors separately. We used a fixed-effects model to calculate the overall pooled risk estimates...
November 30, 2016: Medical Science Monitor Basic Research
https://www.readbyqxmd.com/read/27899150/reporting-of-statistically-significant-results-at-clinicaltrials-gov-for-completed-superiority-randomized-controlled-trials
#8
Agnes Dechartres, Elizabeth G Bond, Jordan Scheer, Carolina Riveros, Ignacio Atal, Philippe Ravaud
BACKGROUND: Publication bias and other reporting bias have been well documented for journal articles, but no study has evaluated the nature of results posted at ClinicalTrials.gov. We aimed to assess how many randomized controlled trials (RCTs) with results posted at ClinicalTrials.gov report statistically significant results and whether the proportion of trials with significant results differs when no treatment effect estimate or p-value is posted. METHODS: We searched ClinicalTrials...
November 30, 2016: BMC Medicine
https://www.readbyqxmd.com/read/27899138/the-impact-of-oxytocin-administration-on-brain-activity-a-systematic-review-and-meta-analysis-protocol
#9
Daniel S Quintana, Tim Outhred, Lars T Westlye, Gin S Malhi, Ole A Andreassen
BACKGROUND: Converging evidence demonstrates the important role of the neuropeptide hormone oxytocin (OT) in human behaviour and cognition. Intranasal OT administration has been shown to improve several aspects of social communication, such as the theory of mind performance and gaze to the eye region, and reduce anxiety and related negative cognitive appraisals. While this early research has demonstrated the potential for intranasal OT to treat psychiatric illnesses characterized by social impairments, the neurobiological mechanisms are not well known...
November 29, 2016: Systematic Reviews
https://www.readbyqxmd.com/read/27898705/the-role-of-the-amygdala-in-facial-trustworthiness-processing-a-systematic-review-and-meta-analyses-of-fmri-studies
#10
Sara Santos, Inês Almeida, Bárbara Oliveiros, Miguel Castelo-Branco
BACKGROUND: Faces play a key role in signaling social cues such as signals of trustworthiness. Although several studies identify the amygdala as a core brain region in social cognition, quantitative approaches evaluating its role are scarce. OBJECTIVES: This review aimed to assess the role of the amygdala in the processing of facial trustworthiness, by analyzing its amplitude BOLD response polarity to untrustworthy versus trustworthy facial signals under fMRI tasks through a Meta-analysis of effect sizes (MA)...
2016: PloS One
https://www.readbyqxmd.com/read/27898323/peripheral-blood-nerve-growth-factor-levels-in-major-psychiatric-disorders
#11
Shuquan Rao, Mónica Martínez-Cengotitabengoa, Yao Yao, Zhiyun Guo, Qi Xu, Suiyan Li, Xianli Zhou, Fuquan Zhang
Nerve growth factor (NGF) plays crucial roles in promoting neural growth and survival, and mediating synaptic and morphological plasticity. Several studies investigated the correlation between peripheral NGF levels and major psychiatric disorders, including schizophrenia (SCZ), major depressive disorder (MDD) and bipolar disorder (BPD); however, the findings were inconsistent. This meta-analysis sought to investigate blood NGF levels in patients with psychiatric disorders compared with healthy subjects and examined potential effects of blood fraction, medication and disease status...
November 22, 2016: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/27897234/association-between-dioxin-and-cancer-incidence-and-mortality-a-meta-analysis
#12
Jinming Xu, Yao Ye, Fang Huang, Hanwen Chen, Han Wu, Jian Huang, Jian Hu, Dajing Xia, Yihua Wu
The objective of the present study was to systematically assess the association between dioxin/2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and cancer incidence and mortality. Systematic literature searches were conducted until July 2015 in Pubmed, Embase and Cochrane library to identify relevant studies. A random-effects model was applied to estimate the pooled odds ratio (OR), risk ratio (RR), standard incidence ratio (SIR) or standard mortality ratio (SMR) for cancer incidence or mortality. In addition, dose-response, meta-regression, subgroup, and publication bias analyses were conducted...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27895498/meta-analysis-of-outcomes-of-patients-with-stage-iv-colorectal-cancer-managed-with-chemotherapy-radiochemotherapy-with-and-without-primary-tumor-resection
#13
Ko-Chao Lee, Yu-Che Ou, Wan-Hsiang Hu, Chia-Cheng Liu, Hong-Hwa Chen
BACKGROUND: Colorectal cancer is the third leading cause of death worldwide. Currently, novel chemotherapeutic agents are first-line therapy for unresectable stage IV colorectal cancer, while benefits of noncurative primary tumor resection in advanced disease remain debatable. OBJECTIVE: This meta-analysis evaluated outcomes of patients with unresectable stage IV colorectal cancer receiving systemic chemotherapy with or without primary tumor resection. MATERIALS AND METHODS: A database search of PubMed and Cochrane Library databases identified 167 studies that were screened for relevance...
2016: OncoTargets and Therapy
https://www.readbyqxmd.com/read/27894200/differences-in-the-association-between-empirically-derived-dietary-patterns-and-cancer-a-meta-analysis
#14
Francesca Bella, Justyna Godos, Antonella Ippolito, Alessia Di Prima, Salvatore Sciacca
Plant-based dietary patterns have been associated with decreased cancer risk. The aim of the present study was to perform a meta-analysis of studies comparing empirically derived dietary patterns in relation to cancer risk. A systematic search of PubMed and EMBASE electronic databases was conducted. Eligible studies had an observational design and evaluated the association with cancer risk between a posteriori derived dietary patterns. Random-effects models were applied to calculate relative risks (RRs) of cancer between diets...
November 28, 2016: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/27891515/the-association-between-vdr-gene-polymorphisms-and-diabetic-retinopathy-susceptibility-a-systematic-review-and-meta-analysis
#15
Yun Zhang, Wei Xia, Ping Lu, Huijuan Yuan
Aims. Studies on the associations of vitamin D receptor (VDR) gene polymorphisms with diabetic retinopathy (DR) susceptibility reported conflicting results. A systematic meta-analysis was undertaken to clarify this topic. Methods. A systematic search of electronic databases (PubMed, EMBASE, and CNKI) was carried out until March 31, 2016. The pooled odds ratio (OR) and 95% confidence interval (CI) were used to assess the strength of the association. Results. A total of 7 studies fulfilling the inclusion criteria were included in this meta-analysis (649 cases and 707 controls)...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27889066/does-thoracoscopy-have-advantages-over-open-surgery-for-asymptomatic-congenital-lung-malformations-an-analysis-of-1626-resections
#16
Stephen Adams, Matthew Jobson, Patarawan Sangnawakij, Adam Heetun, Anthony Thaventhiran, Navroop Johal, Dankmar Böhning, Michael P Stanton
AIM: The apparent incidence of antenatally diagnosed congenital lung malformations (CLM) is rising (1 in 3000), and the majority undergo elective resection even if asymptomatic. Thoracoscopy has been popularized, but early series report high conversion rates and significant complications. We aimed to perform systematic review/meta-analysis of outcomes of thoracoscopic vs open excision of asymptomatic CLMs. METHODS: A systematic review according to PRISMA guidelines was performed...
November 13, 2016: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/27888965/effects-of-nursing-interventions-on-depression-of-patients-with-rheumatoid-arthritis-a-meta-analysis-of-randomized-controlled-trials
#17
Biyun Zhou, Guohong Li, Yuqun Zhang, Zihan Zhao
INTRODUCTION: Previous randomized controlled trials have led to conflicting findings regarding the effects of nursing interventions on depression of patients with rheumatoid arthritis (RA). The purpose of this study was to use the meta-analytic approach to resolve these discrepancies. METHODS: We performed a systematic search of publications using MEDLINE, EMBASE, the Cochrane Library, and manual searches without language restrictions. Studies that met the following criteria were included: (1) randomized controlled trials; (2) duration of intervention≥4 weeks; (3) comparative control group; (4) adults with RA; (5) published studies in any language since reception; and (6) psychological symptoms assessed...
December 2016: Archives of Psychiatric Nursing
https://www.readbyqxmd.com/read/27888156/effects-of-pomegranate-juice-on-blood-pressure-a-systematic-review-and-meta-analysis-of-randomized-controlled-trials
#18
Amirhossein Sahebkar, Claudio Ferri, Paolo Giorgini, Simona Bo, Petr Nachtigal, Davide Grassi
Punica granatum L. (Pomegranate) has been claimed to provide several health benefits. Pomegranate juice is a polyphenol-rich fruit juice with high antioxidant capacity. Several studies suggested that pomegranate juice can exert antiatherogenic, antioxidant, antihypertensive, and anti-inflammatory effects. Nevertheless, the potential cardioprotective benefits of pomegranate juice deserve further clinical investigation. To systematically review and meta-analyze available evidence from randomized placebo-controlled trials (RCTs) investigating the effects of pomegranate juice consumption and blood pressure (BP)...
November 22, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27885859/effect-of-8%C3%A2-months-of-whole-body-vibration-training-on-quality-of-life-in-elderly-women
#19
Fernanda Santin-Medeiros, Alejandro Santos-Lozano, Carlos Cristi-Montero, Nuria Garatachea Vallejo
Whole-body vibration (WBV) training in elderly may improve muscle strength, muscle power and postural control. However, knowledge about the effect of WBV training in elderly on measures of health as a multidimensional construct (health-related quality of life, HRQoL) is scarce. The present study aimed to determine the effects of WBV training on HRQoL in elderly women. A total of 37 women (aged 82.4 ± 5.7 years) were recruited and were assigned to either the WBV group or to the control (CON) group. After 8 months of training, the WBV group showed non-significant changes on HRQoL and additional health-related outcomes (fall risk, life satisfaction or cognitive status)...
November 25, 2016: Research in Sports Medicine
https://www.readbyqxmd.com/read/27885415/resting-heart-rate-and-risk-of-metabolic-syndrome-in-adults-a-dose-response-meta-analysis-of-observational-studies
#20
REVIEW
Xuejiao Liu, Xinping Luo, Yu Liu, Xizhuo Sun, Chengyi Han, Lu Zhang, Bingyuan Wang, Yongcheng Ren, Yang Zhao, Dongdong Zhang, Dongsheng Hu, Ming Zhang
The magnitude of the risk of metabolic syndrome (MetS) with increased resting heart rate (RHR) has been inconsistently reported in some observational studies, and whether a dose-response relationship exists between RHR and MetS is unclear. We performed a meta-analysis including dose-response analysis to quantitatively evaluate this association in adults. We searched PubMed, Web of Knowledge, China National Knowledge Infrastructure, and WanFang databases for articles published up to April 2, 2016. A random-effects model was used to pool relative risks (RRs) and 95% confidence intervals (CIs); restricted cubic spline function was used to assess the dose-response relationship...
November 25, 2016: Acta Diabetologica
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